Kelsey-Seybold Clinic is Houston's premier multispecialty group practice, founded in 1949 by Dr. Mavis Kelsey in Houston's renowned Texas Medical Center. More than 700 physicians and allied health professionals practice at 40+ locations in the Greater Houston area. Kelsey-Seybold offers quality medical care in 65 medical specialties. The organization operates the largest freestanding Ambulatory Surgery Center in the state of Texas and offers state-of-the-art Varian TrueBeam and Varian Edge radiation therapy technology at a nationally accredited Cancer Center. An accredited Sleep Center, comprehensive laboratory services, advanced imaging and diagnostics, 19 onsite Kelsey pharmacies and one specialty pharmacy, and MyKelseyOnline, a secure web portal, are part of its comprehensive offerings.