Our Officers & EJS Team

Nena P. Messina, PhD

Nena Messina is President and CEO at EJS. She is a criminologist with over 20 years’ experience working in criminal justice and substance abuse research. Dr. Messina's areas of expertise include the association between crime, psychiatric disorders, and substance abuse, as well as the specialized treatment needs of drug-dependent women offenders. Throughout her career, Dr. Messina has directed multiple randomized clinical trials funded by the National Institute on Drug Abuse, the California Endowment,  and the National Institute of Justice.

Kira Jeter, M.P.H 

Kira Jeter serves as the Secretary for EJS.  She has over 10 years of experience implementing and evaluating multiple addiction health services and mental health treatment programs for homeless and justice involved individuals. Additionally, she has provided technical assistance on a variety of topics such as data collection, evidence-based practices, project management, and building collaborative partnerships with community-based organizations. Ms. Jeter currently oversees the projects with GEO and Solano County Behavioral Health.

William Burdon, PhD is a Research Director at EJS. He is a Social Psychologist with over 20 years of experience with criminal justice populations. Dr. Burdon’s areas of expertise include substance use treatment, corrections policy, and HIV/AIDS research. Dr. Burdon currently oversees the projects at Pelican Bay, Corcoran State Prison, and CIM. 

Melissa Koba, MA is a research assistant at EJS with a masters degree in Psychology.

Stephanie Schussman, MS is a research assistant at EJS with a masters in Research Psychology and Data Analytics. 

Stacy B. Calhoun, PhD 

Stacy Calhoun is the Vice President at EJSs. She is a criminologist and has been involved in criminal justice and behavioral health research for over 16 years where she has directed numerous research and evaluation studies funded by the National Institute on Drug Abuse, the California Endowment, the National Institute of Justice, and various correctional systems. Dr. Calhoun currently oversees both the CCWF and CIW projects. 

Lindsey Price

Lindsey Price is the Chief Financial Officer/Treasurer for EJS. Ms. Price has been an essential member to the success of numerous startups and small businesses. After taking a break from the startup world for 4 years, in which she worked with a multi-client Accounting and CPA Firm, Lindsey decided to return to her roots of a San Diego based startup. She is now the owner of L. Price Consulting, which specializes in accounting for small businesses and non-profits.

Velda Dobson-Davis is a Retired Annuitant for the CDCR and is the Program Director for both Healing Trauma and Beyond Violence at CCWF. 

Rochelle Leonard is a Retired Annuitant for the CDCR and is the Program Director for both Healing Trauma and Beyond Violence at CIW. 

Carlos Ramirez is a Retired Annuitant for the CDCR and is the Program Director for Exploring Trauma (Moving Beyond Violence) at CIM. 

Michael Tann is a Retired Annuitant for the CDCR and is the Program Director for for Exploring Trauma (Moving Beyond Violence) at Corcoran. 

Liliana Gregorio, BSW is a research assistant at EJS with a bachelors degree in Social Welfare.

Aida Santos, BS is a research assistant at EJS with a bachelors degree in Criminal Justice.