Stone Oak Clinic

Monday, Wednesday, Thursday, Friday 7:30 am – 5:00 pm
Tuesday 7:30 am – 8:00 pm

Dan Powell, M.D.

Dr. Dan Powell was born in Amarillo, Texas and was raised in the Dallas-Fort Worth area. Dr. Powell attended medical school at the University of Texas Health Science Center, where he received his degree in 1991 and completed his residency program at St. Joseph’s Hospital in Denver, Colorado.

Sergio Hernandez, PA-C

Mr. Hernandez was born and raised in Mission City, Texas of the beautiful Rio Grande Valley. Upon graduating high school, he attended undergraduate school to earn his Bachelor of Science in Biology at the University of Texas-Pan American. He continued his Physician Assistant degree at the University of Texas Rio Grande Valley.

Lorrin Tschirhart PA-C

Mrs. Lorrin Tschirhart grew up in a small town near Victoria, Texas called Inez. After graduating college, she moved to Fort Rucker, Alabama while her husband was in Army Flight School before moving to San Antonio in 2018.

Mrs. Tschirhart has always had a passion for medicine ever since she was little, but the desire was confirmed in college when she began to learn more in depth about the role of a Physician Assistant. Her passion also grew through volunteering in hospitals, going on mission trips, and being a medical assistant in college.

I am very proud pleased with Dr. Santoscoy I left my old provider because I couldn't get appointments to get in but I've never had that problem here.

Larry S.