Administration of Justice Department Advisory Board

The Chabot College Administration of Justice Advisory Board members serve as current and former law enforcement officers at the federal, state, and local level; corrections and probation officers; mediators; and experienced attorneys. The Board is a tremendous resource for planning, recruitment, and the overall prestige of the College’s Administration of Justice program.




Lieutenant Angela Averiett has been in law enforcement for 18 years, starting as a Deputy Sheriff with the Alameda County Sheriff's Office. As a Deputy, she worked in the custody and corrections division. In 2001 she was hired by the Hayward Police Department and worked in patrol, traffic and participated in several undercover operations. In 2008 she was promoted to the rank of Sergeant and her assignments included gang unit supervisor and District Attorney Liais on. In June 2014, she was promoted to the rank of Lieutenant and is currently assigned to District Command as the southern district commander. Angela has held a variety of ancillary assignments throughout her career to include Honor Guard manager, Explorer Advisor, Crisis (Hostage) negotiator assistant team leader, mentor, and lead coordinator for the Peer Support Team. In addition, she holds office on several professional boards of directors. She is the Vice President for the California Association of Hostage Negotiators (CAHN), parliamentarian of the Northern California chapter of the National Organization of Black Law Enforcement Executives (NOBLE) and a board member of the Barbershop Forums non -profit organization.

In May 2013 Angela graduated from St Mary's college with a BA in Leadership and Organizational Studies.



Ryan Cantrell is a lieutenant working for the Hayward Police Department in the San Francisco Bay Area. He is currently assigned as the northern district commander for the community policing unit and the project manager for the department’s recruitment efforts and has worked as a patrol watch commander. Prior to his promotion to lieutenant, he was a sergeant supervising the department's Homicide/Major Assaults Unit and worked as the department's Public Information Officer. He has been in law enforcement for over 22 years and has worked in nearly every division within the department. His assignments have included being a 911 Operator, Patrol Officer, School Resource Officer, Field Training Officer, Vice/Intelligence Detective, Patrol Supervisor, Robbery/Property Crimes Unit Supervisor and a Peer Support Team Coordinator.

He is the co-founder of the Alameda County Association of Homicide Investigators – a collaborative of homicide investigators working investigations in Alameda County, established to pool resources, share intelligence, and develop best practices for homicide investigations. He has served on the committee which developed the mandated Human Trafficking training for law enforcement in California (Proposition 35 -CASE ACT). Additionally, he is the founder and former coordinator of the Alameda County Vice Enforcement Team (ACVET) that conducts multi-agency vice enforcement operations that focus on the recovery of exploited children and human trafficking victims throughout Alameda County.

He has conducted large scale human trafficking investigations and street-level prostitution and child recovery operations as a lead investigator and undercover operator. He is a court certified expert in Human Trafficking, Prostitution and Asian Brothel Investigations in the State of California. He also lectures at local community colleges and law enforcement organizations on the topics of: Human Trafficking, Brothel Investigations, Vice Investigations, Prescription Drug Diversion and Alcohol/Tobacco Enforcement.

In January 2013, he published a book titled “Modern Slavery: Investigating Human Trafficking,” which is a guide for law enforcement and concerned citizens about Human Trafficking Investigations.

Lieutenant Cantrell is affiliated with several professional associations such as, the Western States Vice Investigators Association, International Association of Undercover Officers, California Robbery Investigators Association, California Homicide Investigators Association, California Crime Prevention Officers Association, and the California Narcotics Officers Association. He has participated in several FBI and United States Attorney’s Office sponsored task forces and intelligence sharing working groups that focus on child exploitation and human trafficking.

He possesses a bachelor’s degree in Criminal Justice Administration from California State University, Hayward and a master’s degree in Law Enforcement Executive Leadership through California Southern University. His formal training in human trafficking includes courses in Child Prostitution Investigations from the Federal Bureau of Investigation and the Commercial Sexual Exploitation of Children (CSEC) from the DOJ’s Office of Juvenile Justice.


Salvatore Giambona is a licensed criminal defense attorney attorney at Giambona Law Offices. He is a former Deputy Public Defender in Solano County and has handled thousands of criminal cases, including felonies, misdemeanors, and juvenile cases. He has tried nearly forty trials to jury verdict and has conducted countless evidentiary hearings in his time as a Public Defender. Mr. Giambona earned his bachelors degree with honors from the University of California, Santa Barbara in Psychology and Sociology in 2003. In 2007 he earned a Master of Arts in education from the University of California, Santa Barbara. In 2010, he earned his Juris Doctorate from University of California, Hastings College of the Law.

In 2016, the Solano County Bar Association recognized Mr. Salvatore Giambona's work on behalf of his clients and honored him with the Leonard Oldwin Jr.  Memorial Award for zealous advocacy. He became a member of the board of the Solano County Bar Association in 2017.  He is also an advisor to the Contra Costa County Juvenile Justice Commission and is a frequent guest lecturer for the Administration of Justice Department at Chabot College.

Mr. Giambona is a lifelong resident of California and has spent much of this time in the San Francisco Bay Area. 




Charles W. Johnson, Jr. began his forty year professional career teaching 8th grade science and then high school chemistry, while coaching multiple sports for Montgomery County Public Schools, Rockville, Maryland from 1978 - 1985.  During that time, he was recognized as a Mentor Teacher for students and a candidate for educational administration.

In 1985, Mr. Johnson was sworn in as a Special Agent with the Federal Bureau of Investigation (FBI).  Following Quantico training, Charles Johnson was assigned to the Las Vegas Division of the FBI, where he conducted violent crime and property crime investigations.  In 1990, Mr. Johnson transferred to the New York Division of the FBI. In 1998, he transferred to the San Francisco Division.

While conducting violent crime and violent gang investigations, serving as a Program Manager, and Supervisory Special Agent leading a multi-jurisdictional task force, Charles Johnson continued to seek opportunities to provide training to law enforcement. He completed FBI Police Instructor Certification (1990) and Advanced Instructor training (2004).  He conducted courses for law enforcement instructors and served as a trainer and presenter at law enforcement conferences and seminars.  In 2006, Mr. Johnson was in the initial class selected as Adjunct Faculty to the FBI Leadership Development Institute.  He designed and conducted training in interpersonal communication, performance management and team dynamics to law enforcement command personnel. In 2010, Mr. Johnson was selected for the FBI Master Police Instructor award.

 In 2011, Mr. Johnson was invited to serve as the Instructional Team Lead for the FBI Leadership Development Program at Washington, DC.  Leading a team of eight, he provided engaging deployment of leadership principles and facilitation of leadership discussion through week long seminars 2011 – 2013.  After more, that twenty-seven years of service, Mr. Johnson retired from the FBI in 2013.




Chief Darryl McAllister served throughout the ranks of the Hayward Police Department for more than thirty years. October 1, 2014, he was appointed as Union City’s chief of police. His primary focus—both in policing and in education—is to redefine the importance of police-community engagement as a means to promote trust and transparency in today’s policing.

A ranking officer in both cities, Chief Darryl McAllister has commanded several divisions, bureaus, and functions including Patrol Operations, Investigations, Youth and Family Intervention and Counseling Services, School Policing Services, Gang Violence Suppression, Community Policing Services, SWAT, Canine Units, and Media Relations. He also served four years as the Hayward Police Department’s primary Press Information Officer, dealing regularly with news media.

Chief McAllister is also an educator, previously serving as lead faculty at the University of Phoenix, and now as a faculty member of Chabot College, teaching primarily criminal justice and public policy courses. For nearly two decades he has served as a board member of several community organizations, currently serving as the President of the Board at the St. Rose Hospital Foundation, and as a member of the advisory board of the University of San Francisco's International Institute of Criminal Justice Leadership.  He participates on the selection panel for the California State Commission on Peace Officer Standards and Training’s Command College Program, and on the board of the San Francisco Bay Area Chapter of the National Organization of Black Law Enforcement Executives.   He serves on the boards of several nonprofit organizations in the East Bay, and, in his spare time, he is a youth mentor with Reality Mentor, Inc.

He is a two-time nominee and one-time recipient of Hayward’s Police Officer of the Year Award, a 2007 Recipient of the “Hayward Pearl Award” honoring volunteer service to the community, and he was also awarded in 2013 as University of Phoenix’s Faculty Member of the Year for the San Francisco Bay Area Campus region.  In 2015, he was selected by the Southern Alameda County NAACP for its most prestigious honor—the “Person of the Year” Award.

His manuscript, Law Enforcement Turns to Face Recognition Technology, was published by Information Today Magazine in May 2007.  His strategic plan, 2008 and Beyond, was officially adopted and published by the City of Hayward in December 2008, and was the first of its kind for the organization since 1991.  In 2016, he was honored to be one of a select number of police chiefs in the country to be invited to the White House to take part in a critical discussion with President Obama and his staff about how to build trust between police and the communities they serve.

Chief McAllister holds a Bachelor’s Degree in Occupational Studies from California State University, Long Beach, and a Master’s Degree in Administrative Development from Alliant International University.  He is currently completing coursework for a Doctorate in Educational Leadership at Saint Mary’s College of California.  He is a graduate of the FBI National Academy in Quantico, Virginia—a professional course of study for U.S. and international law enforcement leaders. He is also an alumnus of the California Command College—a graduate level futures study program of the California State Commission on Peace Officer Standards and Training.



Officer Paul Medina has served as a correctional officer with the California Department of Corrections and Rehabilitation since 1997. Officer Medina has distinguished himself during his twenty years of law enforcement experience. Currently, Officer Medina is the Lead Gang Investigator with the Investigative Services Unit at California State Prison, Solano. He has identified and validated hundreds of gang members and associates and regularly testifies in court as a subject matter expert on Nuestra Familia and Mexican Mafia, both notorious prison gangs. Part of his role includes debriefing members of various prison gangs, including the Aryan Brotherhood, Black Guerrilla Family, Mexican Mafia, and Nuestra Familia. 

Among his other important assignments, Officer Medina has directed his attention to investigations at Pelican Bay and Corcoran State Prisons which contain Security Housing Units (SHUs) within CDCR.  He has participated in numerous street operations partnering with both state and federal law enforcement to target Nuestra Familia Leadership. He regularly trains external law enforcement at all levels on gang activity, as well as presenting at universities and colleges across the state of California. Officer Medina is an active member with the following organizations: California Gang Task Force, California Gang Investigators Association, Central Coast Gang Investigators Association, Northern California Gang Investigators Association, Orange County Gang Investigators Association, Riverside County Gang Investigators, and the National Alliance of Gang Investigators Association. ​



Deputy Gary Mitchell is a native of North Carolina and has lived in both Southern and Northern, California, as well as abroad since 1980.  He was born to the parents of six boys and four girls, all of whom choose careers in public service areas, including the Military, Law Enforcement, and Nursing.

Deputy Mitchell has dedicated most of his life to serving his country both at war and in peace, in public and a military capacity. He has served a long and distinguished career in the United States Marine Corps, retiring with honor after twenty years of service.  While in the Marines, Deputy Mitchell served as a Tank Commander in Operation’s Desert Storm and Desert Shield.  He was subsequently selected by the U.S. Department of State to become a Diplomatic Security Officer, overseeing security at the United States Embassies in Cairo, Egypt and Nairobi, Kenya.  His final assignment with the United States Marine Corps was with the Recruiting Command in San Francisco, California.  He enjoyed his time in the Bay Area and decided to make it his permanent home.

Deputy Mitchell has continued to serve his country and community as a First Responder and Law Enforcement Officer with the Alameda County Sheriff’s Office for more than ten years. Deputy Mitchell has completed multiple assignments during his tenure with the Sheriff’s Office, including his current assignment with the Backgrounds and Recruiting Unit as a Background Investigator. Deputy Mitchell enjoys Law Enforcement and cannot think of a better way to give back to society and be a role model than that of serving and helping people. Semper Fi.    




John Ojo is a Correctional Lieutenant with the California Department of Corrections and Rehabilitation (CDCR). Currently, Lt. Ojo is serving as the Public Information Officer at the California State Prison Solano.  He earned a Bachelor of Arts Degree in Business Management from Dominican University of California in 2002. He also graduated from the University of Southern California, Price School of Public Policy Safe Communities Institute Program in 2016. During his tenure with the CDCR, he has played an integral role in training staff on various policy initiatives and departmental policy changes.

Lt. Ojo is committed to the realization of CDCRs mission to administer justice while providing meaningful rehabilitative opportunities. In his efforts, he has partnered with inmate mentors, local law enforcement agencies, mental health professionals, local religious groups, inmate families, ultimately resulting in the ALPHA program, an organization focusing on mentoring and empowering troubled youth in our local communities.




Mattie Robertson is a dispute resolution professional who has facilitated over 300 cases, and is certified as both a mediator and arbitrator. She has mentored other professional mediators and conducted numerous conflict resolution trainings. Mrs. Robertson previously worked for SEEDS Community Resolution Center managing the Court Mediation Program, which provided same-day mediation services to litigants in the Alameda County Superior Courts. She is currently Program Director for the Arts Arbitration and Mediation Services (AAMS) program for California Lawyers for the Arts in the Bay Area. Mrs. Robertson also serves as Co-Chair for the Alameda County Bar Association's ADR Executive Committee, and is a member of the Chabot College Administration of Justice Department’s Advisory Board.

Mrs. Robertson is a graduate of UC Hastings College of the Law in San Francisco, has a Bachelors in International Relations from San Francisco State University.




 Tamara has 13 years of solid diverse experience in the Alameda County Probation Department, in both juvenile and adult divisions. She is intensely familiar with the function and goals of probation, Courts and institutions. She has worked with youth in a variety of settings from minimum security camps and county schools to maximize security institutions such as juvenile hall. During her time as a Deputy Probation Officer, she has collaborated with parole agents, task force, schools, group homes and community based organizations. As a juvenile DPO, Mrs. Scott was involved in developing Reaffirming Young Sisters Excellence, an all female intense program, one of few in the United States. She worked intimately with adolescent girls, their families and connected them with any community based service that would aide them in becoming successful.  She has also worked in mental health court, working intensely with families, therapists, attorneys, and case managers. Mrs. Scott advocates for juveniles, while also holding them accountable to their conditions of probation. In her field work, she develops case plans and keeps statistics to help track the progress of individuals, write dispositions, progress reports, revocation and modifications reports and recommendations to the Court that would be in the best interest of the ward and society. 

In the adult division, Mrs. Scott held a specialized caseload of sex offenders, domestic violence and served on the Domestic Violence Committee, which was composed of community providers. She has also been trained in motivational interviewing and evidenced based practice.

Mrs. Scott served on the Juvenile Justice Commission and Delinquency Prevention Commission in Contra Costa County for eight years. From 2013-2015, she served as Co-Chairman, implementing new policies and procedures and by-laws and trainings for Commissioners.  Additionally, Mrs. Scott is a guest speaker at local colleges.


Advisory Board Meetings