Board certified by the American Board of Internal Medicine in Endocrinology, Diabetes and Metabolism in 1977 after completing his fellowship at the National Institutes of Health Clinical Center (1975), Dr. Jeffrey A. Sandler runs his Hillcrest endocrinology clinic from Suite 340 at 4060 Fourth Avenue. Sandler earned his MD from the University of Illinois College of Medicine in 1971 and served as one of the medical directors of the Scripps Whittier Diabetes Institute, the endocrinology hub that traces back to the 1924 Scripps Metabolic Clinic, and his current practice coordinates with Balboa Nephrology - Hillcrest for diabetic kidney disease co-management. His visit panel covers type 1 and type 2 diabetes, Hashimoto thyroiditis, Graves disease, thyroid nodule workup, hypoparathyroidism, polycystic ovary syndrome, adrenal insufficiency, and pituitary adenoma follow-up. On-site testing spans thyroid and parathyroid ultrasound, TSH panels, continuous glucose monitor initiation, and A1C trending across multi-medication regimens including GLP-1 agonists and SGLT2 inhibitors. Thyroid nodules with suspicious fine-needle aspiration cytology route to Pacific Coast Surgical Group for hemithyroidectomy or total thyroidectomy, with Sandler managing post-operative levothyroxine titration and calcium monitoring. The most complex recurring workflow is brittle type 1 diabetes with hypoglycemia unawareness, where Sandler pairs continuous glucose monitoring with automated insulin delivery pump programming to rebuild the counter-regulatory response.