TMAC, Trauma Managers Association of California


The Directory of the Trauma Managers Association of California includes both hospital and EMS agency trauma managers from across the state.

The list of current members is available in the Members Only section of the website.

2020 Board of Directors

Sharon Brown, MSN, RN, CCRN, TCRN, ONC

Sharon Brown

Sharon Brown has worked in the trauma nursing field for over 15 years in various roles at Arrowhead Regional Medical Center.  During this time she has attended several trauma-related conferences and seminars to further her knowledge of trauma nursing care.  She is currently an instructor for ATCN and implemented the Stop the Bleed program at ARMC.  Although  her role has broadened in terms of nursing scope, trauma always has and always will be her passion.

ARMC is a 456-bed university-affilliated, Level II ACS verified trauma center and regional burn center.  Annual trauma volume is between 3300 and 3600 patients.


Christine McGahey, RN, BSN

Christine McGahey

Christine McGahey brings over 18 years of experience in patient focused care specializing in nursing leadership in Emergency, Neurosurgery, Orthopedics and Trauma. She has worked at Kaiser Permanente, an Adult Level II Trauma Center in South Sacramento, California for the past 3 1/2 years as the Trauma Program Director. Christine has a strong background in developing and implementing policy and procedures with proven success in the implementation of organizational strategies. She received her Bachelors of Science Degree in Nursing from Western Governors University and is currently finishing up her Masters of Science in Nursing Leadership. Christine spent many years working as an adjunct Nursing Instructor where she was named Preceptor of the Year by the University of the Pacific.

Ashwini Chand-Kumar, RN, BSN, MBA

Ashwini Chand-Kumar

Ashwini Chand-Kumar has more than 19 years of experience in nursing and leadership. She has worked as an Emergency room, ICU, case management and Trauma Process improvement nurse. Ashwini has a Bachelor’s of Science in Nursing from San Jose State University and a Master of Business Administration in Healthcare Management from Western Governors University. She is a TNCC instructor and have certification in emergency and trauma care. Certificated as AIS coder for trauma registry.

Wendy McEuen, RN, MSN, CEN, TCRN

Wendy McEuen

Wendy currently works as Trauma Outreach and Injury Prevention Coordinator.  She holds National certifications in Emergency and Trauma nursing.  She has 15 years experience in the Emergency department including staff nurse, charge nurse, MICN and Educator.

Melissa Harte, DNP, MSHA, RN, TCRN
Director at Large for Hospitals

Melissa Harte

Melissa Harte has spent the majority of her career in Emergency Medicine and Trauma.  She recently joined Regional Medical Center, San Jose as the Vice President of Trauma Services.  Since 2007, Melissa has served as a Liaison, Board Member, and President of the Society of Trauma Nurses.  Her current roles for STN are: Liaison for TCRN Review; Leadership Committee Member; Faculty Lead for Leadership Institute 2020; and Pediatric Trauma Nursing Curriculum Peer Reviewer. 

Shanna Kissel
Director at Large for EMS

Shanna Kissel

Shanna Kissel is the Trauma Nurse Coordinator/Clinical Supervisor for the Riverside EMS Agency.  She started her career in 2003 on the Pediatric floor at Huntington Memorial Hospital in Pasadena. From there she continued to work with pediatrics at Long Beach Memorial- Miller West for 2 years. After moving to Riverside, Shanna made a department change to the Emergency Department at Riverside County Regional Medical Center. She was a bedside nurse and charge nurse while she was working on her BSN.

Shanna made the transfer into Trauma Services in 2009 and it was here that she became the Performance Improvement / Injury Prevention Nurse. This was her “home” and comfort zone in the trauma world. During this time she worked on her Master’s Degree in Nursing Administration and wanted to utilize this in her career. In 2014, she was given the opportunity to be the Trauma System Coordinator for Riverside EMS Agency which she has been doing for two years. As the Trauma System Coordinator, she has been involved in a multi-county trial study from data collection to implementing county wide education. In her current role she recently published a Trauma System Report using county-specific trauma data as a tool for agencies to use for Injury Prevention and Education. She is always seeking ways to improve trauma patient care from the system perspective.

Georgi Collins, MSN, RN, PHN
Immediate Past President

Georgi Collins

Georgi Collins has over nineteen years of clinical experience specializing in nursing and leadership roles in critical care, emergency, pre-hospital, and trauma care. For the last nine years, she has worked at Riverside Community Hospital as the Trauma Program Director of an Adult Level II Trauma Center in Riverside, California. Previously, she managed the County of San Bernardino’s Trauma System further enhancing her in-depth understanding of California’s Trauma Regulations and EMS standards. Currently, Georgi serves as the AVP of Hospital Corporation of America’s (HCA) Trauma Services, which encompasses four Level II Trauma Centers in California and Nevada - the largest of which is Sunrise Medical Center that recently played a pivotal role in managing over 150 trauma activations from the 1 October Incident.  In her current role, she is responsible for managing all trauma-related activities across the Far West Division with an emphasis on the need for continuous assessment of individual programs, personnel, resources and survey readiness.   

Georgi received her Master’s Degree in Nursing with a focus on population-based nursing from California State University, San Bernardino. She is a member of HCAs Trauma Nurse Advisory Council (TNAC), which is charged with developing trauma-related best practices.  These best practices support all 90 of HCA’s Trauma Centers and includes performance improvement initiatives, clinical topics and trauma financial pro-forma. Georgi is also the Chair of HCA’s Trauma Services Policy Taskforce and develops Enterprise-wide Diversion and Trauma Activation Criteria. Georgi performs mock ACS surveys in preparation for ACS Consultative and Verification site visits for all of HCA and is working on developing a site-preparation course for TNAC. Georgi has also been a member of TMAC for over ten years. 

Georgi, a native Californian, lives in San Bernardino County with her husband, two children, seven dogs, and three horses. She enjoys riding her horses and spending time with her family.

Previous Members of the Board

Many people have dedicated their time and energy to TMAC, which has made it the premiere organization for trauma professionals in the state of California.

Below are individuals who have most recently served on the Board of Directors

  • Heather Venezio, RN, MS, CEN

    • President Elect, 2017
    • President, 2018
    • Immediate Past President, 2019
  • Denise Greci Robinson, RN, MS, CNS

    • Secretary, 2018-2019

  • Michelle Woodfall, MS, RN, CEN, CCRN

    • Treasurer, 2017-2018
  • Amy Brammer, BSN, RN, TNS, CEN, CAISS, CSTR

    • Director-At-Large for Hospitals, 2018-2019

Susan Watson, BAcc
Executive Assistant

Susan Watson

Susan is currently the Financial Services Assistant and Executive Secretary for Mountain-Valley EMS Agency.  She received her Bachelor of Science in Accounting from the University of Phoenix.  Susan has a long work history in administrative duties, technical writing, information technology and accounting support.  She is a veteran of the U.S. Army, serving more than a decade both at home and abroad.  Over the course of her civilian work experience,  she has served city, county and federal government agencies as well as the private sector.  In her leisure time, Susan enjoys caring for her home and family, spending quality time with her grandchildren, and devoting volunteer hours to service within the local community.