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Sandra Alexander, MPA, BAS, CMA (AAMA)

Program Director and Faculty
El Centro College

Originally from Cleveland, Ohio, Sandra Alexander has lived in the Dallas area since 1985. She became the director of the Medical Assisting program at El Centro College in the fall of 2009.

Employed in the medical field since 1965, she most recently worked as a certified medical assistant (CMA, AAMA) for Arco Oil and Gas Co. and as a CMA office manager with the Dallas Diagnostic Association.

She has served as adjunct faculty for Richland College allied health professions since 1999.

Sandra holds a Master and Bachelor of Arts and Science degrees in healthcare administration from Grand Canyon and Dallas Baptist University and is credentialed as a CMA through the American Association of Medical Assistants.

Steven Carter, M.S.

Adjunct Faculty

Steven Carter holds a bachelor’s degree in psychology and a master’s degree in rehabilitation counseling psychology from Texas Tech University. He has published numerous articles in professional journals and has conducted research in areas related to disability and rehabilitation.

Having taught many years in the field of vocational rehabilitation psychology, he has also served as a vocational disability expert in court cases in eight states and has served as an expert on Social Security disability appeals. He has taught anatomy and physiology, vocational rehabilitation, medical and psychological aspects of disability, pathophysiology and psychology-related coursework at the college level since 1984.

He is the coordinator of workforce and continuing education programs at El Centro College and a private practitioner in vocational evaluation at Career Assessment Services in Dallas, where he continues to do vocational evaluations for selected cases.


Lisa Lock, M.B.A., B.S.M.T., MT(ASCP)BB, CLS(NCA)

Adjunct Faculty

Lisa Lock has served as the director of the Medical Laboratory Technology program since 1997. She worked as a medical laboratory technologist in blood banking and hematology for seven years and in a laboratory administrative role for eight years. She holds a bachelor’s degree in medical technology from Louisiana State University in Baton Rouge (Geaux Tigers!) and a Master of Business Administration degree from Amberton University.

Nehal Rangnekar, M.S., CPC

Adjunct Faculty
Medical Assisting program

Nehal Rangnekar is an adjunct faculty member in Brookhaven College’s Medical Front Office program and in El Centro College’s Medical Assisting program. She holds a master’s degree in biochemistry and a bachelor’s degree in chemistry, both from University of Mumbai, India. She has also completed a diploma program in computer studies from the Bureau of Information Technology Studies in India, a certificate program in Medical Assisting from El Centro College and a certificate program in Medical Coding and Billing from Collin County Community College.

She currently teaches Medical Terminology, Medical Records Management, Computer Fundamentals and Medical Office Simulation courses for the Medical Front Office program at Brookhaven College. She also serves as an adjunct faculty member in El Centro College’s Medical Assisting program teaching Computers in Healthcare and Medical Insurance courses, and is a continuing education instructor teaching Medical Front Office Management for the health care division at Collin College. She also was a Microsoft Office applications instructor in India.

She is a member of the American Academy of Professional Coders and Phi Theta Kappa, the international honor society for two-year colleges. She is a certified professional coder certified by the American Academy of Professional Coders.

“Just the idea that I can make a difference in a student’s life by sharing information gives me great inspiration and motivation to continue teaching for as long as I can,” she says.

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El Centro Campuses


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801 Main Street
Dallas, TX 75202
Phone: 214.860.2000
Web: Downtown Campus

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1402 Corinth Street
Dallas, TX 75215
Phone: 214.860.5900
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3330 N Hampton Rd
Dallas, TX 75212
Phone: 972.391.1400
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