Karen Amendola, Ph.D.

Karen L. Amendola has over two decades of experience in public safety research, testing, training, technology, and assessment. With the Police Foundation for over 20 years, Dr. Amendola currently serves as the Chief Behavioral Scientist. Amendola earned both her Ph.D. and M.A. in Industrial and Organizational Psychology from George Mason University, as well as an M.A. in Human Resources Management from Webster University. Karen has worked with dozens of local, state, and federal agencies. Dr. Amendola was Associate Editor for Psychology and Law for the ten-volume Encyclopedia of Criminology and Criminal Justice published by Springer Verlag, New York (2014).

In addition, Dr. Amendola was the lead investigator of a study of eyewitness identification case outcomes. A series of articles on that research and it’s outcomes were publishied in the esteemed Journal of Experimental Criminology (Amendola & Wixted, June, 2015). With her colleagues, Amendola’s recent work “An experimental study of compressed work schedules in policing: advantages and disadvantages of various shift lengths” was also published in the Journal of Experimental Criminology and was awarded the 2012 Outstanding Field Trial by the Division of Experimental Criminology of the American Society of Criminology (a synopsis of the Shift Length Experiment is available online).
Dr. Amendola is a member of the Academy of Criminal Justice Sciences, American Psychological Association, American Society of Criminology, and Society for Industrial and Organizational Psychology, and served over five years on the Scientific Review Committee of the National Center for Credibility Assessment (at the time called the Department of Defense Polygraph Institute).

Most recently Karen served as Chair of the National Partnership for Careers in Law, Public Safety, Corrections, and Security, and as a member of the research advisory board of the Innocence Project in New York.

Areas of Expertise:

  • Shift scheduling practices
  • Officer Safety, Health, and Wellness
  • Evaluation of Evidence
  • Hiring, Selection, and Promotion
  • Eyewitness Identification Procedures
  • Organizational Culture
  • Applied Psychology in Policing
  • Performance Measurement
  • Psychology and Law

Curriculum Vitae


Rob Davis

Robert C. Davis is the Police Foundation’s Chief Social Scientist. He has 30 years of experience in criminal justice research and evaluation, and was the Foundation’s research director from 2003-2006. Davis returned to the Foundation after working as a senior research associate at the Rand Corporation and as research director for the Police Executive Research Forum.

Davis has directed more than 35 projects on victimization, domestic violence, policing, crime prevention, immigration, courts, prosecution, and parolee reentry for federal and state governments, and private foundations. He has led projects with some of the nation’s leading law enforcement agencies.

At the Police Executive Research Forum and the Rand Corporation, Davis led research projects spanning areas from victimization to policing to transitional security. Projects included assessing factors that affect the solvability of homicide and sexual assault cold cases, conducting a national evaluation of victim’s rights clinics, identifying successful strategies to promote sustainability of justice reform programs, and creating a leadership training institute for the Dallas Police Department. He completed projects on subjects ranging from a review of international best practices in police performance measurement to an assessment of how to best oversee police in the nation of Liberia.

While research director with the Police Foundation, Davis led a project assessing the preparedness of retail shopping malls to a potential terrorist attack, and a review of the effect of intervention efforts in preventing a repeat of domestic violence.

He was a senior research associate at the Vera Institute of Justice in New York from 1998-2003. He led a project for the New York Police Department that surveyed more than 5,000 citizens each month in order to develop measures of citizen satisfaction with police interactions that could be used to hold precinct commanders accountable for service to the public. An expert in victims’ rights issues, Davis worked in a series of positions serving victims for nearly 20 years at the Vera Institute, for New York City, and for the American Bar Association.

He is the editor of the widely used book Victims of Crime, which is in its fourth edition. He has authored two books on crime prevention, is the editor of six books on crime prevention and victimization, and is the author of more than 100 journal articles and book chapters.

Davis received a Bachelor’s Degree and a Master’s Degree in experimental psychology from the University of Wisconsin.


Craig B. Fraser, Ph.D.

Dr. Craig B. Fraser joined the Police Foundation in 2015 with over fifteen years of experience conducting law enforcement management studies. Dr. Fraser previously served as the Director of Management Services for the Police Executive Research Forum (PERF), from 1994 to July 2015.

Dr. Fraser has managed studies of over 250 law enforcement agencies in the U.S. and abroad for police agencies in Texas, California, North Carolina, Colorado, Ohio, Pennsylvania, Louisiana, New York, Minnesota, Florida, Oklahoma, Nevada, and, Utah.

Dr. Fraser also has subject matter expertise in police technology, training, and resource allocation. Dr. Fraser has also authored training guides on police resource allocation, staffing and deployment, taught extensively on the topic, and conducted 50 specialized staffing and deployment studies.

Dr. Fraser also held a joint position of Director of Training, Richmond Police Department and Director of the Criminology/Criminal Justice Program, Virginia Union University. Dr. Fraser received his Master’s and Ph.D. in Political Science from Purdue University.


Katherine Hoogesteyn, Ph.D.

Dr. Katherine Hoogesteyn joined the National Police Foundation as a Research Associate in January 2021. She holds a Ph.D. in Legal Psychology from Maastricht University (the Netherlands) and Portsmouth University (U.K) and a B.A in Psychology from Florida International University. Katherine has over 7 years of research experience in areas related to investigative interviewing practices, including tactics for information elicitation and rapport-building. Her primary interest is on science-based policing and working alongside police practitioners on how to most effectively translate scientific findings into practice.


Eiryn Renouard

Eiryn Renouard is a Research Assistant at the National Police Foundation. Her research interests include police-community relationships, gender dynamics within police agencies, symbolic interactionism, and masculinity in police culture. She received her B.A. in Sociology, Writing, and Economics from Gonzaga University in 2019. She has worked on a number of projects for other organizations, including a survey assessing nonprofits’ data communication needs and a research piece on behavioral health and resources in the Inland Northwest.


Travis Riddle, Ph. D.

Dr. Travis Riddle joined the National Police Foundation as a Data Scientist in October 2020. He has previously held positions at the National Institutes of Health, Princeton University, and Columbia University. Dr. Riddle has methodological expertise in multilevel models, Bayesian inference, and text analysis. He has applied his skills to projects in education, health, media, and metascience. He has mentored junior researchers through independent research projects and seen his mentees go on to successful careers in consulting, tech, and academia.

Dr. Riddle has a PhD in Psychology from Columbia University and a bachelor’s degree in Psychology from San Francisco State University.


Maria Valdovinos Olson

Ms. Valdovinos Olson is a Senior Research Associate for the Police Foundation, where she works on a portfolio of domestic and international projects in law enforcement and criminal justice. She is an experienced researcher and project manager with ten years of experience working to advance a diverse portfolio of federally and privately funded, multi-year research projects and initiatives in policing and corrections research across support, management, and leadership capacities.

Current projects span the areas of safety and wellness within police and corrections, community policing in the United States and Mexico, and the impact of a procedural justice intervention on crime hotspots and police legitimacy. Ms. Valdovinos Olson has also worked in the areas of unmanned technologies for public safety, eyewitness identification procedures, critical incident reviews within corrections, and targeted violence on college campuses.

Ms. Valdovinos Olson earned her B.A. from Northwestern University, has an M.A. in Sociology from George Mason University and is currently pursuing her Ph.D. in Sociology. Her research interests are in the role of police in society, criminal justice/legal system reform, and reentry policy. She is a fluent Spanish speaker and has language proficiency in German and modern standard Arabic.


Heather Vovak, Ph.D.

Heather Vovak is a Senior Research Associate at the Police Foundation. She previously worked on several federally and privately funded research projects in policing at the Center for Evidence-Based Crime Policy at George Mason University. Her research interests include police investigations, technologies in policing, crime rate and clearance rate trends, and she specializes in group-based trajectory analysis. Heather received her Ph.D. in Criminology, Law and Society from George Mason University, her M.A. in Political Science from the University of Akron, and her B.S. in Political Science and Psychology from Heidelberg University.



Hannah Xiaoyun Wu, Ph.D.

Dr. Hannah Xiaoyun Wu is a Senior Research Associate at the National Police Foundation. Her research interests include policing, evidence-based program evaluation, and the innovative application of quantitative methods and data analysis to challenging criminological problems. Her recent work focuses on understanding the efficacy of everyday proactive police work in reducing crime and accidents and the use of social media by law enforcement agencies in response to critical social issues. She has been involved in several randomized and quasi-experiments and is proficient with analyzing data of various types (e.g., cross-sectional, longitudinal, panel, survey, and GPS location data).

Dr. Wu received her M.A. and Ph.D. in Criminology, Law and Society from George Mason University. Prior to joining the NPF, she was a post-doctoral research fellow at the Center for Evidence-Based Crime Policy at George Mason University and Managing Editor of Criminology and Public Policy.

Hannah Wu