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Ana G. Ruiz Allison, MD

Medical Director

Dr. Allison has 31 years experience working as a doctor and 23 in Texas. Her specialty is Internal Medicine, with an emphasis on Endocrinology and  Diabetes Management. She graduated from the University of Puerto Rico School of Medicine, San Juan Puerto Rico. She completed her fellowship in Internal Medicine in Puerto Rico as well.  She has had research published in the Journal of Oncology. She speaks Spanish fluently and enjoys spending time with her patients and helping them with their medical needs.

Carlos Bernal, MD

Family Medicine

Dr. Bernal is a family practice doctor who graduated from medical school at UTMB in Galveston. He has over 30 years of medical experience and has also served in the military. He has worked in various clinics throughout Texas and came to Pasadena Health Center from Good Shepard Medical Clinic in Marshall, Texas. He is currently helping Pasadena Health Center to establish a Saturday Clinic.

Dr. Harlan Wichelhaus


Dr. Wichelhaus specializes in OB/GYN services. He attended Bowman Gray School Of Medicine (Wake Forest University) in 1981. He has served in the United States Air Force and completed an internship at Keesler Air Force Base Medical Center in OB/GYN. He has over 31 years of medical experience and currently maintains a private practice in addition to his work at Pasadena Health Center.

Lissy John, DDS


Dr. John is a graduate of the University of Texas School of Dentistry. Dr. John worked in private practice before coming to Pasadena Health Center and has been rated by patients as an excellent dentist.

Danny Edwards, LPC

Licensed Professional Counselor

Mr. Edwards graduated from University of Houston Clear Lake and is licensed as a Marriage and Family Counselor, Licensed Chemical Dependency Counselor, and Licensed Professional Counselor. He currently works full time in private practice in Alvin and part time for the clinic. He works with both children and adults and can counsel on many issues including chemical dependency, attention deficit disorder, depression, and marriage counseling.