Phone: (830) 379-8371. Location: 515 N King St., Suite 106 Seguin, TX 78155. VIEW MAP. Medical School: Baylor College of Medicine. Residency: Wilford Hall United States Air Force Medical Center. Accreditations & Certifications: Provider Bio: After receiving his medical degree from Baylor College of Medicine, Jack Deetjen, MD served in the Air ....