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About Us

Mallory O’Brien, PhD

Director of Homicide Review Commission

Dr. Mallory O’Brien is the Founding Director of the Milwaukee Homicide Review Commission. Dr. O’Brien is trained as an epidemiologist and has worked in the field of violent injury prevention for the past 20 years. In 1994 she began her work developing, implementing and evaluating a regional tracking system for firearm deaths, the Firearm Injury Reporting System, at the Medical College of Wisconsin. From 2001 through 2007 she continued her work, expanding to the national level as the Associate Director of the National Violent Injury Statistics System at the Harvard Injury Control Research Center, at Harvard University. From 2007 through 2011, as a researcher with Duke University, Terry Sanford Public Policy Institute, she worked on a randomized control trial of reentering gang-involved offenders. Dr. O’Brien has served as a consultant to the Wisconsin Department of Health and Family Services, Wisconsin Violent Death Reporting System, the Centers for Disease Control and Prevention, National Violent Death Reporting System. She is currently a member of the WI Attorney General’s Crime Victim Council, Governor’s Criminal Justice Coordinating Council and Partnership Council of Milwaukee and the Milwaukee Community Justice Coordinating Council. Dr. O’Brien is currently employed at the Medical College of Wisconsin in the Institute for Health and Society. Dr. O’Brien has been honored with awards from the Federal Bureau of Investigation (Director’s Community Leadership Award) and the US Department of Justice, Project Safe Neighborhoods (Outstanding Contribution by a Researcher).

Michael Totoraitis

Violence Prevention Research Coordinator

Homicide Review Commission

City of Milwaukee Health Department - Office of Violence Prevention

Michael has been working in the greater metro Milwaukee area for over 8 years. Michael comes to the MHRC from Safe & Sound, Inc. where he served as a Community Prosecution Unit Coordinator assigned to Milwaukee Police Department's District 7. There Michael worked with residents and law enforcement to address nuisance properties. After a short period working out in District 7, Michael became the Program Supervisor for the agency. In this role Michael worked closely with staff at Safe & Sound and Milwaukee residents to address quality of life and public safety concerns. Earlier in his career, Michael was the Associate in Research for the MHRC team during the evaluation of the Milwaukee Safe Streets Prisoner Reentry Initiative. In this project, Michael was responsible for the data collection and coordinating follow-up for the research team at Duke University's Terry Sanford Public Policy Institute. The project drew together state and local resources focusing on assisting DOC-DCC clients with successful reentry into the community. Mr. Totoraitis performs project management support (e.g., convening data sharing partners, meeting with database developers), assisting with all major project’s research activities and program activities (assisting nonprofit organizations with the interpretation of data and assess the results of local initiatives using interdisciplinary data), administering the project’s evaluation tools and reporting evaluation findings.

Police Officer Heather Coss

Milwaukee Police Department Staff

The Milwaukee Police Department supports the functions of the Milwaukee Homicide Review Commission, in part, by providing two full time staff positions. One of these staff positions is a police officer that prepares the homicide cases for review. Officer Heather Coss is currently assigned to the MHRC. Officer Coss is responsible for developing presentations for each review and presenting homicide cases at the domestic violence and community service provider reviews.  She assists with the analysis of trends in homicides, non-fatal shootings, and non-fatal domestic violence incidents that lead to the development of action plans for recommendations arising from the homicide review process.  Officer Coss also brings a strong background in criminal justice systems to the MHRC. Officer Coss joined the Milwaukee Police Department in 1996, Officer Coss' understanding of police policies and procedures is a unique asset to the review commission.


Milwaukee Police Department Staff
The Office Assistant is responsible for the everyday office functions including the Homicide and Non-Fatal Shooting databases. These databases are critical to ensure that data provided to MPD and its partners is accurate and timely.




Milwaukee Homicide Review Commission Logo

749 West State Street, 3rd Floor

Milwaukee, WI 53233

Contact Us

Phone: 414-935-7985
Fax: 414-935-7987


Mallory O'Brien

Violence Prevention Research Coordinator

Michael Totoraitis

Milwaukee Police Department Staff

Police Officer

Heather Coss

Office Assistant II