Founding Members

All good ideas start with good people.  In our case, the American Society of Evidence-Based Policing was started by a small group of like-minded policing folks. We are all active in law enforcement as Police Officers, Sergeants, Lieutenants or Crime Analysts but collectively, we felt it was time for a change.  Our bios are below but you’ll probably find that we’re just like you… we want to make a difference in our profession and encourage you to join us.

Renee Mitchell, President

Renée J. Mitchell has worked for the Sacramento Police Department (SPD) since 1998 and is currently a sergeant in the Court Liaison Unit. Within SPD, she created several innovative programs such as the Female Fitness Challenge and CSI Sacramento; inspired the CASH (Community Against Sexual Harm) program; and developed the Community Recruiter manual and program. She was the principal investigator on a department-led, 90-day randomized control trial in hot spots policing that employed the Koper Curve theory and showed promising results.The study won the 2012 IACP/Sprint Excellence in Law Enforcement Research Silver Award.

She has a Bachelor of Science degree in psychology from the University of California, Davis; a Master of Arts in counseling psychology from the University of San Francisco; a Master of Business Administration from the California State University, Sacramento; and a Juris Doctorate from the University of the Pacific, McGeorge School of Law, where she was awarded an academic scholarship.  Renée is a Ph. D. candidate at the University of Cambridge, where she is a Jerry Lee Scholar.

Renée was the 2009-2010 Fulbright police research fellow, attending the University of Cambridge Police Executive Programme and completing research at the London Metropolitan Police Service in juvenile gang violence.

Renée is a member of the California Bar Association, the Society of Evidence-Based Policing, the International Association of Chiefs of Police and the International Association of Crime Analysts.


Daniel Wagner, Vice President

Dan Wagner is a Lieutenant with the Cambridge, Massachusetts Police Department where he serves as the commanding officer of the Crime Analysis Unit.  Dan is currently working towards a Master of Public Administration from the John F. Kennedy School of Government at Harvard University.


Julie Wartell, Founding Member

Julie Wartell is an independent advisor on public safety issues relating to crime analysis, problem solving and justice systems. Shehas previously served as crime analyst coordinator for the San Diego District Attorney’s Office; project director of the East Valley COMPASS Initiative (a regional analysis effort); crime analyst for the San Diego Police Department, researcher for the Institute for Law and Justice and the Police Executive Research Forum, and fellow at the National Institute of Justice Crime Mapping Research Center. Wartell has performed a wide range of research on and analysis of various crime problems and police-related issues, worked on strategic planning efforts, and coordinated the development of a series of crime mapping training modules. She has conducted extensive training and made presentations to officers and analysts around the world on topics relating to crime analysis and problem-oriented policing, has edited or authored numerous publications, and currently teaches GIS in Urban Studies at the University of California–San Diego. Wartell has a master’s degree from San Diego State University in public administration with an emphasis in criminal justice administration and a Postgraduate Diploma in Applied Criminology and Police Management from University of Cambridge.


Rachel Tolber, Founding Member

Rachel Tolber began her law enforcement career in 1998 in Redlands, California, where she is currently a Sergeant in charge of Investigations, Property & Evidence and Crime Analysis. She has served the department in a variety of positions, including: Field Training Officer, Patrol Officer and Supervisor, Detective, Range Master, and Professional Standards and Training.

During her tenure with RPD, she was instrumental in creating the Police and Corrections Team (PACT), and spearheaded the Citizen Volunteer Park Rangers for the City of Redlands. Rachel also served as an Executive Intern to the Redlands City Manager, where she helped lead policy and strategic initiatives adopted and implemented by city executives. She has received civic recognitions and honors for her leadership, work and service.

Rachel’s law enforcement background includes extensive collaboration and work with numerous local, state and international law enforcement agencies. In addition, she worked with the department’s criminologist on various research projects and grants. Her research interests include re-entry, restorative justice, and technology. She has been a board member of the Home Again Project, Gang Reduction Intervention Team, and presently serves on the board of the San Bernardino Sexual Assault Services.

She received her Bachelor degree from the University of Redlands, California, in 1998. She received a Masters in Criminology, Law and Society from the University of California, Irvine in 2006. In 2011, she received a Masters in Applied Criminology and Police Management from the University of Cambridge, United Kingdom.

During her course of study at the University of Cambridge, Rachel examined the feasibility of conducting a randomized control trial in order to test restorative justice among the parole population in Redlands, California. Her thesis was selected to be housed in the Radzinowicz Library collection.

Rachel is a member of the Society of Evidence Based Policing (SEBP) and the International Association of Chiefs of Police (IACP).


Greg Stewart, Founding Member

Greg Stewart is a sergeant and 19-year veteran of the Portland Police Bureau.  He currently runs the Bureau’s Crime Analysis Unit.  Sergeant Stewart has served as a patrol officer, including working in both a walking beat and conducting street level drug investigations, and as a patrol sergeant. Additionally, he supervised for the Bureau’s Domestic Violence Reduction Unit and worked to implement one of the nation’s first automated actuarial risk assessment systems.  This system was used to conduct risk-based case assignment aimed at targeting domestic offenders with the highest risk of recidivism for additional follow-up.

Sergeant Stewart has an undergraduate degree in Psychology from Lewis and Clark College and a master’s degree in science from Portland State University’s Criminology and Criminal Justice Program.  His studies included the use of geographic information systems, statistics, research methods and data analysis.  His culminating project for the master’s degree consisted of training a group of college students to code police use of force cases for both traditional variables (force factor) and also for constitutional factors such as governmental interest and level of control achieved prior to the application of force.  He then conducted checks on inter-rater reliability to demonstrate the feasibility of reliably coding factors related to constitutionality from administrative records of police use of force.

Sergeant Stewart has presented at a number of academic and professional police conferences such as the International Association of Chiefs of Police, the International Association of Crime Analysts and the American Society of Criminology.  His research has touched on issues such as police use of force, the use of risk assessment tools to improve case assignment, the impact of stereotype threat on citizen/police interactions and exploring alternate patrol strategies aimed at simultaneously maximizing police legitimacy and crime reduction. He has also trained or consulted for police agencies from the United States, Canada, Bangladesh, Mexico and the Ukraine.


Josh Young, Founding Member

Joshua Young is a Corporal with the Ventura Police Department currently assigned to the Patrol Division. Prior to his promotion, Corporal Young worked as an undercover Police Detective for five years and served 6 ½ years as a tactical operator on the Ventura Police Department’s SWAT team.

Corporal Young was the principal investigator, along with Dr. Barak Ariel (University of Cambridge), in a 12-month randomized controlled trial at Ventura Police Department. This experiment evaluated the effects of body-worn video cameras on police use-of-force, citizens’ complaints, and prosecution outcomes.

Corporal Young has a Master’s Degree in Criminology and Police Management from the University of Cambridge. His Master’s thesis focused on how police agencies can successfully integrate evidence-based practices to sustain innovations such as body-worn cameras within their organization.

Corporal Young is a Fellow at the Police Foundation and an adjunct instructor of Criminal Justice at Ventura College.  He is a recognized subject matter expert on body camera technology and has provided training and policy recommendations to law enforcement agencies throughout California.

Corporal Young is an advocate of police science and a founding member of the American Society of Evidence-Based Policing.


Andrew Mendonsa, Founding Member

Sergeant Andrew Mendonsa is a 17-year veteran with a rural Sheriff’s Office in Northern California. During his career, he has served in a wide variety of assignments, including Court Security, Patrol, SWAT, Administration and Training and Standards.  He is currently a Sergeant in the Investigations Bureau, supervising the investigation of crimes including homicide, robbery, sexual and child abuse.

Sgt. Mendonsa  has previously served as a Field Training Officer, Primary Firearms Instructor and Sniper Team Leader.  He is a certified instructor at a state law enforcement academy, teaching crisis intervention, victimology and search warrant preparation.  He has served as a subject matter expert in law enforcement marksmanship and was part of the first detective cognitive study administered by the California Peace Officer Standards and Training.  Sgt. Mendonsa formerly served as an adviser to the Los Rios Community College law enforcement academy in Sacramento.
Sgt. Mendonsa holds a Bachelor of Science degree from California State University-Long Beach, and is currently completing his Master’s degree in Criminology and Penology at the University of Cambridge.  His research interests including procedural justice, legitimacy, and sentencing theory.


Stuart Greer, Founding Member

Stuart Greer is a Lieutenant with the Morristown (NJ) Police Department. His emergency services career began as an Emergency Medical Technician in the cities of Irvington and Newark before being selected for appointment as a Police Officer in 1998. During his time in uniform he worked through every assignment in the Patrol Division including a foot post, bicycle patrol, traffic safety unit, and as a field-training officer. He was selected for assignment to the Criminal Investigations Unit in 2006 and worked as a general case Detective. Following his assignment to a Detective Squad, he was promoted and transferred to the Services Division. As a Sergeant, he was responsible for Police Records and OPRA, Property & Evidence, Firearms and Cellblock Management and was tasked to manage various projects including a complex transfer from a local to a regional public safety dispatch model.

In his current assignment, Lieutenant Greer serves as the Commanding Officer of the Criminal Investigations Unit with direct responsibility for managing all Detectives, the Anti-Crime Unit and the Property & Evidence Unit. In addition, he serves as the departmental Public Information Officer and training coordinator.

Lieutenant Greer earned a Bachelor of Arts degree in Justice Studies from the College of Saint Elizabeth (Morristown, NJ) and  a Master of Studies (MSt) in Applied Criminology and Police Management at the University of Cambridge (UK) where he conducted an experimental trial to test the effectiveness of checklists in initial responses to burglary investigations.  He is currently pursuing a Master of Public Administration at New York University.  He is a New Jersey Police Training Commission certified instructor  teaching numerous in-service courses to both recruits and sworn officers and has traveled around the U.S. teaching evidence-based approaches to reducing homicide and gun violence to Police Commanders.

Lieutenant Greer is a member of the International Association of Chiefs of Police, Police Executive Research Forum, Society for Evidence Based Policing, American Society of Criminology and the Morris County Detectives Association.  More importantly, he is a proud member of the Tartan Army and follows Scotland as they continue their way to world football domination (decidedly not based upon evidence).


Obed Magny, Founding Member

Dr. Obed Magny grew up in Boston, MA where he earned his BA in Criminal Justice and Sociology at the University of Massachusetts. Magny relocated to Sacramento where he obtained a Master of Science in Emergency Services Administration from California State University at Long Beach, and a Doctorate of Education in Organizational Leadership from the University of La Verne.

Magny is currently a Police Officer at the Sacramento Police Department engaged across various lines of the Department; such as Narcotics, School Resources, Crime Suppression and Parole Intervention. Magny also served on the Board of Directors for the Sacramento Police Officer’s Association for three years.

In addition, Magny is a Level I and Level II instructor for TalentSmart, which is the world’s largest provider of Emotional Intelligence training.



Jim Bueermann

Chief Jim Bueermann (Ret)

In September 2012, Jim Bueermann was appointed as the president of the Washington, DC-based Police Foundation. Founded in 1970, the Police Foundation is America’s oldest non-partisan, non-profit police research organization. The mission of the Police Foundation is “to advance policing through innovation and science.”

He worked for the Redlands Police Department for 33 years, serving in every unit within the department and retired in the summer of 2011. He was appointed Chief of Police and Director of Housing, Recreation and Senior Services in 1998. From June 2011 until September 2012 he served as an Executive Fellow with the US Department of Justice’s National Institute of Justice and a Senior Fellow at George Mason University’s Center for Evidence Based Crime Policy.

As a police chief, he developed a holistic approach to community policing and problem solving that consolidated housing and recreation services into the police department and was based on risk and protective factor research into adolescent problem prevention. This strategy was recognized as one of the country’s 25 most innovative programs in the 2000 Innovations in American Government program sponsored by Harvard’s Kennedy School. 

Jim was the first police chief inducted as an Honorary Fellow into the Academy of Experimental Criminology and into the Halls of Fame at George Mason University’s Center for Evidence Based Crime Policy and the School of Behavioral Science at California State University, San Bernardino. 

He is on policing advisory boards at Cambridge University and George Mason University, was appointed by US Attorney General Eric Holder to the US Department of Justice’s Science Advisory Board and serves on the the FBI National Academy’s Advisory Board. He was recently appointed to the National Academies of Sciences Panel on Proactive Policing and served on the Academies Roundtable on Crime Trends and Stanford University’s Executive Session on Correctional Realignment. In addition, he works extensively in the field of evidence based policing, innovative technologies and prisoner reentry. 

He is a graduate of California State University, San Bernardino, the University of Redlands, the FBI National Academy and the California Command College.