Dr. Casey Waller, PT, DPT, OCS, a board-certified Orthopedic Clinical Specialist in Carlsbad's Poinsettia area, serves as clinic director at the Longevity Physical Therapy location on Loker Avenue West in the 92010 zip code. Waller earned the OCS credential held by fewer than five percent of U.S. physical therapists, and his Applied Functional Science training drives root-cause biomechanical assessments for orthopedic injuries—a spine and joint rehabilitation approach that coordinates with manual-therapy providers along the same corridor, including Phillips Chiropractic. In addition to leading a team of four doctoral-level therapists at the Carlsbad clinic, Waller holds an adjunct professorship in the undergraduate kinesiology department at Point Loma Nazarene University, bridging clinical practice with academic instruction. His functional-biomechanics model emphasizes identifying the mechanical origin of pain rather than treating symptoms in isolation, with return-to-sport progressions extending into high-intensity training environments such as Carlsbad CrossFit for patients cleared for loaded movement. Advanced cases involve multi-segmental spinal stabilization protocols using three-dimensional functional loading progressions for patients with recurrent lumbar disc herniation following failed conservative management.