​El Centro College Department of Emergency Medical Education Team


​​Alexander L. Flores MBA, MS, Lic. Paramedic
Emergency Medical Education Coordinator

Alexander has over 14 years experience in the EMS industry and is a Licensed Paramedic.  He has worked in varied health care settings from first-responder organizations to a metropolitan 911 service.  

He holds a graduate degree in health education and undergraduate degree in health from Texas A&M University.  He also has earned a Master of Business Administration  degree from Texas Woman’s University.  Alexander is pursuing a Doctorate in Health Sciences from NOVA Southeastern University.

Alexander has led El Centro College’s Emergency Medical Education team since 2019.

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Dr. Gregory  Winters PhD, MPA, NRP, Lic. Paramedic
Paramedic Program Coordinator

Greg has over 30 years of public safety and healthcare experience ranging from hospital to pre-hospital patient care, air medical transport, EMS management, tactical medicine, critical care transport, firefighting, and law enforcement.  Greg started his medical career as a Health Occupations student in high school, and soon began to work in a busy, aggressive 911 system. Following that he was a flight paramedic on both rotor and fixed wing platforms for nearly 20 years.  

He holds a PhD in Health Psychology from Northcentral University, a Master’s Degree in Public Administration from UT San Antonio, a Bachelor’s Degree in Emergency Management Administration from West Texas A&M, and an AAS in Paramedicine Technology from Amarillo College.  

Dr. Winters has been a full-time EMS educator since 2009.



Sheila Elliott BS, Lic. Paramedic
TxDSHS EMS Program Coordinator
EMT Program Coordinator

Sheila has been an educator since 1994 and involved in EMS Paramedic Education since 2007,when she caught the “EMS bug” after her son was flown by CareFlite for his 4th open heart surgery.  She has a Bachelor’s Degree in Education from Texas Tech University and is pursuing a Master’s Degree from Western Governors University.  Sheila has experience working in 911, hospital ER, and organ recovery.  However, her passion is EMS education and helping students reach their potential.  Sheila is also on the Board of Directors of the Texas Association of EMS Educators.



Dr. Matthew Nash PhD, M.A., NRP, Lic. Paramedic
Lead Faculty Coordinator

Dr. Nash started serving the public in 2001 working with humanitarian NGO’s and non-profits.  Because of the nature of the NGO’s he served, which tended to have a heavy focus on health care for the poor and the underserved, Dr. Nash became curious about the medical side of public service.  This curiosity led to a transition into EMS. Following EMT school Dr. Nash worked with Medstar Mobile Healthcare starting in 2011 and served with them in a number of roles (field and educational) until 2015. From 2015-2016 he taught International Relations at a leading university in Indonesia.  After the Indonesian contract was finished Dr. Nash got back into EMS education where he continues to work today. 


Matthew holds a PhD in Public Policy and Administration from Walden University and a Master’s degree in Government from Regent University.


Dr. Nash joined El Centro full time in 2016.



Mike Ziem BS, Lic. Paramedic
Faculty Coordinator

Mike has worked in EMS for 25 years and is a Licensed Paramedic. His experience includes pre-hospital EMS, hospital-based EMS, fight medicine, and military service as a Fleet Marine Force Navy Corpsman.

He holds a Bachelor's degree in Emergency Health Science from the University of Texas Health Science Center San Antonio and is pursuing a Master’s degree in Applied Cognition and Neuroscience from the University of Texas at Dallas.  

Mike has been a full-time EMS educator since 2008.
Photo of Mike Ziem


Dr. Gilberto Salazar MD