Our Team

Our interdisciplinary staff and international network of collaborators consist of clinicians, researchers, and trainers from a wide range of studies and interests including sociology, psychology, anthropology, epidemiology, ethnography, medicine, data science and biostatistics, and public health.

Dr. Walker S. Carlos Poston, M.P.H.

Chief Executive Officer and Senior Scientist

Dr. Poston has graduate degrees in the behavioral sciences (University of California, Santa Barbara) and epidemiology...

Dr. Poston has graduate degrees in the behavioral sciences (University of California, Santa Barbara) and epidemiology (University of Texas Houston Health Science Center, School of Public Health). Dr. Poston completed postdoctoral fellowships in Behavioral Health Psychology (Wilford Hall Medical Center) and in Cardiovascular Health (American Hospital Association Health Forum). His research focuses primarily in the areas of obesity, tobacco control, and cardiovascular disease prevention with an emphasis on minority populations and military and first-responder health. He has been a principal investigator or co-investigator on grants from the American Heart Association (AHA), the American Legacy Foundation, the National Heart, Lung, and Blood Institute, the National Institute of Digestive Disorders and Kidney Diseases, the Agency for Healthcare Research and Quality, the Department of Defense US Army Medical Research and Material Command, and the Department of Homeland Security/FEMA. He also has been the recipient of a Minority Scientist Development award from AHA.

Annette Carrar

Chief Financial Officer

Annette Carrar created a viable organization by reorganizing and transferring the research and administrative activities...

Dr. Carrar created a viable organization by reorganizing and transferring the research and administrative activities of NDRI to NDRI-USA, INC. Developing a secondary line of business to create income and lessen the dependence on grants which have become more competitive and offer financial remuneration with a 1990 price tag.

Prior experience includes several years in banking, Wall Street and the principal architect of a technical, financial and human resources operation for an ESOP with annual revenues of $68 million, 450 employees.

Attended Harvard University’s Graduate School of Business - Program for Management Development.

Dr. Sara Jahnke

Chief Operating Officer and Senior Scientist

Dr. Jahnke has over a decade of research experience on firefighter health, she has been the Principal...

Dr. Jahnke has over a decade of research experience on firefighter health, she has been the Principal Investigator on ten national studies as well as dozens of studies as a co-investigator. Her work has focused on a range of health concerns including the health of women firefighters, behavioral health, risk of injury, cancer, cardiovascular risk factors, and substance use with funding from the Assistance to Firefighters Grant R&D Program, the National Institutes of Health and other foundations. She has more than 100 publications in peer-reviewed medical literature.

Dr. Christopher K. Haddock

Chief Data and Analytics Officer and Senior Scientist

Dr. Haddock completed graduate work in both Clinical Psychology and Statistics and Research Methodology at...

Dr. Haddock completed graduate work in both Clinical Psychology and Statistics and Research Methodology at the University of Memphis and the Pennsylvania State University as well as Fellowships in Clinical Health Psychology from the United States Air Force and Cardiovascular Health from the Health Forum of the American Hospital Association. His professional background also includes training in data science and strength and conditioning. Dr. Haddock is an Accredited Professional Statistician (PStat®) with the American Statistical Association, a Fellow with The Obesity Society, and a Certified Personal Trainer with the National Strength and Conditioning Association (NSCA-CPT®). He has served as the Principal, Co-Investigator, or Biostatistician on a large number of National Institutes of Health, Department of Defense, Federal Emergency Management Agency, and American Cancer Society grants as well as foundation and private industry-sponsored grants and contracts. His current research is diverse, ranging from evaluating detection methods for toxic exposures among firefighters, PTSD treatment for military personnel, best methods to promote fitness and health among military and first response personnel, tobacco control research, and the impact of the opioid epidemic on veterans. Dr. Haddock has published over 200 scientific articles, most focused on first responder, military, and veteran’s issues. He is a decorated military veteran having served both on active duty in the U.S. Air Force and as an active Reserve officer.

Dr. Nattinee Jitnarin

Chief Operating Officer

Dr. Jitnarin received her doctorate in Health Psychology with a Health Behavioral Science Emphasis...

Dr. Jitnarin received her doctorate in Health Psychology with a Health Behavioral Science Emphasis at the University of Missouri-Kansas City and completed an NIH-funded postdoctoral fellowship in Behavioral Sciences Training Program in Drug Abuse Research at the National Development and Research Institutes, Inc. in New York City. She also completed graduate certificates in Applied Statistics (Pennsylvania State University) and Occupational Health and Safety (Johns Hopkins University Bloomberg School of Public Health). Dr. Jitnarin’s research primarily focuses on health behavior (e.g., diet, exercise) and addictive behavior research, particularly tobacco use. She has a strong background in study coordination and experience in health outcomes research, specifically in statistics, epidemiology, and food and nutrition, as well as health-related behaviors. She has also been involved in the conduct and analysis of a number of large studies including cohort/observational studies and randomized controlled trials. Dr. Jitnarin currently serves as the Principal Investigator of the American Cancer Society-funded study focusing on developing and evaluating an occupationally-tailored smokeless tobacco cessation program in the U.S. Fire Service.

Christina Donawa, SPHR, SHRM-SCP

Director of Human Resources

Christina Donawa is the Director of Human Resources for NDRI-USA, responsible for all human resource policies...

Christina Donawa is the Director of Human Resources for NDRI-USA, responsible for all human resource policies, programs and services for the organization. Christina has over 28 years of responsible and progressive experience in human resource management. She holds a degree in Economics and Business Management and human resources senior professional designations. She is a current member of the national and local chapters of the Society of Human Resources.

Marie McEachern

Grants Management Director

Marie McEachern is the Senior Grants Director at NDRI-USA. She is a skilled Grants Director...

Marie McEachern is the Senior Grants Director at NDRI-USA. She is a skilled Grants Director specializing in regulatory compliance, budget planning and execution, and financial management and analysis to expertly manage pre-and post-awards from federal, state, and foundation sponsors. She is equipped with over twenty (20+) years of accounting and grants management experience in the non-profit field since earning her Accounting Information Systems Degree from Pace University in New York, New York.

Carol Tarzian

Assistant Grants Management Director

Carol Tarzian has over 25 years of administrative experience in the non-profit sector, including over 15 years of providing...

Carol Tarzian is the Assistant Grants Management Director of NDRI-USA. She holds a Bachelor’s degree in psychology and has over 25 years of administrative experience in the non-profit sector, including over 15 years of providing supportive services to senior management, Board of Directors, and Institutional Review Board. She is responsible for facilitating grant and contract submissions to various funding sources, as well as maintaining requisite federal, state, and local registrations to ensure institutional compliance in the areas of grant administration and finance. She also serves as the liaison between our research scientists and Institutional Review Board, responsible for coordinating ongoing oversight of all research activities involving human subjects to ensure protection of subjects and compliance with federal regulations.

Dr. Christopher M. Kaipust, M.P.H.

Associate Research Scientist

Dr. Kaipust received his Master of Public Health in Epidemiology from the University of Texas...

Dr. Kaipust received his Master of Public Health in Epidemiology from the University of Texas School of Public Health (UTSPH). He then completed his Ph.D. in Epidemiology, and was a National Institute for Occupational Safety and Health (NIOSH) Doctoral Occupational Epidemiology Trainee at the Southwest Center for Occupational and Environmental Health at UTSPH. Dr Kaipust serves as an Epidemiologist/Biostatistician in the Research Methodology and Data Analytics core at NDRI-USA, and in that role has been involved in the design, conduct, and analysis of several large studies on first responder, law enforcement, and military health and safety. His research focuses on Total Worker Health and health disparities in the occupational setting.

Dr. Brittany Hollerbach

Associate Scientist and Deputy Director of the Center for Fire, Rescue, and EMS Health Research

Dr. Hollerbach received her Ph.D. in Kinesiology from Kansas State University and recently...

Dr. Hollerbach received her Ph.D. in Kinesiology from Kansas State University and completed a postdoctoral research fellowship at Skidmore College under the direction of Dr. Denise Smith where she focused on cardiovascular disease in the fire service. Dr. Hollerbach has extensive experience working with the fire service on a number of federally funded firefighter studies examining behavioral health issues in the fire service including obesity, nutrition, physical activity, sleep, substance use, and mental health. She recently received FEMA funding as the Principal Investigator (PI) on a project examining firefighter perceptions of protective strategies used to mitigate the spread of COVID-19. Dr. Hollerbach has an interest in firefighter health in general and translation and dissemination of firefighter health research specifically, given her background as a former firefighter. She also has experience teaching at the fire academy and is well-connected to the fire service community in Kansas City.

Dr. Barbara Tempalski

Scientist

Dr. Tempalski's research focuses on the nexus of health, social, and political geographies in measuring the geographic...

Dr. Tempalski's research focuses on the nexus of health, social, and political geographies in measuring the geographic distribution of services, response and prevention of HIV and opioid misuse among key populations (i.e., people who inject drugs, men who have sex with men, and high risk heterosexuals). She has been a NIDA-funded Investigator and collaborator for over 20 years on a number of studies including the recently funded study “Developing a public health measure of built environment to assess risk of nonmedical opioid use and related mortality in urban and non-urban areas in New Jersey” (R21 DA046739) where she is the Principal Investigator

She has extensive expertise on the study of programs as responses to the HIV and opioid epidemic and planning and conducting analyses of program trajectories, place determinants, and consequences. She broadly identify as a health and social geographer where her research expertise includes measuring and modeling the geographic distributions of HIV/AIDS epidemics among key populations and identifying the sociopolitical and structural responses to these distributions and measures in US metropolitan areas overtime. This research includes measuring the need for syringe exchange service provision and availability of substance use treatment services. At its core, her research concerns the health effects of multi-level place factors, operating in both urban and non-urban settings, to better quantify local area-level processes that contribute to behavioral risk and health inequalities among vulnerable populations.

Dr. Tempalski’s research on place-based risk environments has contributed to new knowledge in understanding how geographic place shapes HIV-opioid risk environment among vulnerable populations. That is, through understanding the dynamics of place, and how the socio-spatial and political processes related to a place, we can better help determine where HIV-opioid risk environments occur and implement needed services to reduce related harm.

Dr. Tempalski served as a consultant for USAID evaluating the utility of Geographic Information Systems (GIS) as a tool for integrating schistosomiasis control in Egypt. She also worked for UNICEF examining the utility of a GIS in evaluating Dracunculiasis eradication policies in West Africa. She has conducted reproductive health research in Nepal focusing on use of condoms and HIV knowledge among Nepalese women, and how physical landscape bears on this knowledge. She has further served as consultant to the Spatial Working Group, University of Porto, Portugal developing a geospatial epidemiology model for use by European Monitoring Centre for Drugs and Drug Addiction, Lisbon for surveillance and monitoring of drug use and infectious disease.

Her research has been published in several top-tier journals, including the American Journal of Public Health, International Journal on Drug Policy, Substance Abuse Treatment, Prevention, AIDS and Behavior, and Policy and Health & Place.

Dr. Maria Koeppel

Associate Research Scientist

Dr. Koeppel received her Ph.D. in Criminal Justice from Sam Houston State University where she worked for the Crime Victims' Institute...
Dr. Koeppel received her Ph.D. in Criminal Justice from Sam Houston State University where she worked for the Crime Victims' Institute and the Correctional Management Institute of Texas. During that time, she was involved in data collection in prison facilities, as well as a legal aid needs assessment for rural communities in Texas. After graduation, Maria worked as a Research Analyst for the Kansas Department of Corrections where she played an active role in writing policy and legislative recommendations. Prior to joining NDRI-USA, Maria worked as a full-time firefighter, a position she maintains on a part-time basis.

Dr. Sean T. Doyle, MSBA, Major (retired) USAF

Consulting Health Economist

Sean’s military career was equally split between hi-viz operational assignments ...
Sean’s privileged military career was equally split between hi-viz operational assignments and rigorous academic tours. Among Sean’s numerous highlights, a few include: six months deployed to Saudi Arabia on the front lines as an Avionics Journeyman on the F-15 fighter aircraft; four & one-half years on faculty as an Assistant Professor of Economics - USAFA’s “Outstanding Academy Educator”, Department of Economics & Geosciences, for Academic Year 2011/2012; a one year volunteer unaccompanied deployment as the Deputy Director (Financial Management & Comptroller) in Qatar – directly responsible for $400M in Overseas Contingency Operations; and a prestigious one & one-half year post as an Economic Analyst at the Pentagon, with a $10B portfolio. His work was ultimately published at the Department of Defense Headquarters, Washington, D.C., in June 2019, documenting the successful systematic redesign of Air Force Central Command’s $1.2B budget mid-fiscal year, and earned his Financial Management Team the Air Combat Command (ACC/FM) Innovation Award in Financial Management.[i] After two plus decades of dedicated public service that included 4 deployments (Afghanistan 2011 as well), Sean is a Postdoctoral Fellow with the National Development & Research Institute, USA (NDRI-USA) - NDRI's exclusive economist. Dr. Doyle’s research intersects at the crossroads of health and economics, specializing in demand elasticities, cost utilization, and social gradient.

Jeanne Barnhill

Senior Graphic Designer

Jeanne Barnhill is a Senior Graphic Design Specialist with 25+ years of successful experience...

Jeanne Barnhill is a Senior Graphic Design Specialist with 25+ years of successful experience in the complete design process. She specializes in taking ideas from conceptualization to finished products. Software mastery includes; Adobe Creative Suite – Illustrator, Photoshop, Indesign, Acrobat Pro. Corel Draw, Microsoft Office

Jeanne enjoys the outdoors (particularly kayaking), comic book art, and pet rescue. She has lived with her wife in Kansas City, MO for the last three decades.

Laurie VandeSchoot, MSc

Instructional Design Specialist

Laurie VandeSchoot is a consulting Instructional Design Specialist with 25+ years of experience...

Deputy Fire Chief Laurie VandeSchoot (Retired) consistently advocates for diverse communities and the change initiatives necessary to shift culture. She is an executive-level change agent who is known for building inclusive and high-performing cultures that strengthen communities while working in municipal government (32 years) and consulting internationally (25 years). Laurie holds several interdisciplinary degrees, including an MSc in Sustainable Development; leads numerous international fire service programs and committees on diversity, executive leadership, and human relations; and has delivered over 500 training and development programs to emergency service, public service, and post-secondary institutions on Equity, Diversity & Inclusion, Gender, Cultural Competency, LGBTQ+ Awareness, Leadership Development, Strategic Planning, and Mission Focused Transformation. In recognition of her passion for diversity and inclusion, she received an Immigrants of Distinction, an Organizational Diversity Award for outstanding achievements in implementing cultural diversity initiatives, and a Federation of Canadian Municipalities Award for outstanding contributions to international cooperation.

Blake Skola

Research Assistant

Blake Skola currently manages the social media pages for the Center for Military & Veterans Health Research...

Blake Skola currently manages the social media pages for the Center for Military & Veterans Health Research and the Center for Fire, Rescue & EMS Health Research. He has assisted with many other projects, including leading the Army PRT group for the ATHIS study at the Command and General Staff College in Fort Leavenworth, Kansas. He joined the fire service in 2009 and currently works as a Firefighter/EMT for the Central Jackson County Fire Protection District, where he is a member of the Health & Safety and Professional Development committees. He is also an instructor at the fire academy and is a certified Peer Fitness Trainer. He enlisted in the Army Reserves in 2001, and currently holds the rank of Sergeant First Class. SFC Skola spent 15 months in Iraq in 2004-2005 with the 428th Transportation Company, whose mission was providing security escorts for supply convoys. His current duty assignment is Senior Drill Sergeant with A Company, 3/378th Battalion. Awards and decorations include Warrior Leaders Course Honor Graduate, Drill Sergeant School Honor Graduate, Fort Knox Iron Professional, 1/354th Battalion Best Warrior, 95th Division Drill Sergeant Of The Year, Gold German Armed Forces Proficiency Badge, Bronze Excellence in Competition Rifleman's Badge, Iraq Campaign Medal, Combat Action Badge, and Basic Parachutist Badge.

Carrie Sutherland

Research Assistant

Carrie Sutherland graduated with her Master’s in Psychology with a research concentration from Avila University....

Carrie Sutherland graduated with her Master’s in Psychology with a research concentration from Avila University. Her prior research focused on replication work and stereotyping, discrimination, and prejudice against women and individuals who identify as transgender. While at Avila, she was the lab manager of the Wagge Lab and was a CREP Assistant, a collaborative project that aims to open science and provide research opportunities to students and professors. Carrie served as a teaching assistant during her graduate work in psychology classes at the graduate and undergraduate levels, leading to her current part-time role as an adjunct professor of psychology for psychological methods and statistics. Currently, Carrie serves as the Project Coordinator for NDRI-USA and actively maintains responsibilities as a qualitative research associate.

Melanie Arce McDowell

Research Assistant

Melanie Arce McDowell is the Administrative Research Assistant for NDRI-USA and the Center for Fire, Rescue & EMS Health Research....

Melanie Arce McDowell is the Administrative Research Assistant for NDRI-USA and the Center for Fire, Rescue & EMS Health Research. She graduated from the University of Kansas with a Bachelor's degree in Psychology. She spent a year abroad as an Au pair in Turin, Italy and also lived and worked in Austin, Texas for several years before returning to Kansas City with strong opinions on live music & breakfast tacos. She has worked in the retail medical / optical industry for the past 17 years until recently joining the team at NDRI-USA. She is also a freelance commercial photographer, loves to travel, and enjoys spending her free time with friends, her new husband, and their four pets: three aging dogs and one surly cat.