He treats adults and children. Dr. Grewal studied at New York Institute of Technology, New York College of Osteopathic Medicine in Old Westbury, University of Rochester (Bachelor’s), North Shore-LIJ Health System, Plainview Hospital for his Residency in Orthopedic Surgery. In addition to studying at Peninsula Hospital Center for an Internship in Orthopedics and at the University of California, San Francisco for his Fellowship in Adult Spine and Deformity Surgery.