Dr. Walker is a Professor of Clinical Medicine at the College of Physicians and Surgeons, Columbia University in the Division of Endocrinology. Dr. Walker received her undergraduate training at Wesleyan University (Middletown, CT) and her medical training at the Johns Hopkins University School of Medicine in Baltimore, Maryland. She completed her internship and residency in Internal Medicine at the Johns Hopkins Hospital in 2002 and went on to complete a 3-year fellowship training program in Endocrinology, Diabetes, and Metabolism at the College of Physicians and Surgeons, Columbia University. Dr. Walker joined the faculty at the College of Physicians and Surgeons in 2005. Dr. Walker also completed a Master's Degree in Biostatistics and Patient-Oriented Research at the Mailman School of Public Health, Columbia University in 2009.

Dr. Walker is board-certified in Internal Medicine and Endocrinology and is an International Society for Clinical Densitometry-certified Clinical Densitometrist. Dr. Walker's clinical activities involve seeing patients in the Metabolic Bone Diseases Unit at Columbia with a variety of disorders including postmenopausal and glucocorticoid-induced osteoporosis, idiopathic osteoporosis, hyper- and hypoparathyroidism, Paget's disease, fibrous dysplasia, osteomalacia, and osteopetrosis.

Dr. Walker also has academic responsibilities which include teaching endocrine pathophysiology to first-year medical students and serving as a preceptor for 3rd-year medical students during their medicine Clerkship. Additionally, Dr. Walker attends on the inpatient Internal Medicine and Endocrinology consult services with residents and fellows.