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 600 physicians and allied health professionals practice at 31 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, 16 on-site Kelsey Pharmacy locations, and MyKelseyOnline, a secure web portal, are part of its comprehensive offerings. Kelsey-Seybold pa