Meet Our Physicians

At the Center for Cancer Care, a service of Gwinnett Medical Center, physician services are provided by the independent practitioners of Suburban Hematology-Oncology Associates, P.C.

We’d like to take this opportunity to introduce you to our doctors:

Dr. Alan FreedmanAllan Freedman, MD
Allan Freedman, MD, earned his medical degree from the University of Vermont and completed post-graduate training at Grady Memorial Hospital. He completed his fellowship in medical oncology and hematology at Emory University Hospital.

Dr. Freedman is board-certified in internal medicine and medical oncology. He is an active member of several professional medical organizations, including the American Society of Clinical Oncology and the Georgia Society of Clinical Oncology, and is a board member of the Georgia Cancer Pain Initiative.


Dr. Christopher HagenstadChristopher Hagenstad, MD
Christopher Hagenstad, MD, earned his medical degree from the Wake Forest University School of Medicine in Winston-Salem, North Carolina. After completing post-graduate training at the Medical College of Virginia, he returned to Wake Forest University and completed a fellowship in medical oncology.

Dr. Hagenstad is board-certified in internal medicine and medical oncology. He is an active member of several professional medical organizations, including the American Society of Clinical Oncology, the Georgia Society of Clinical Oncology and the Georgia Medical Society. Dr. Hagenstad serves as a member of the Cancer Committee at Gwinnett Medical Center.

Dr. Hagenstad is married and has three children. His hobbies include hiking, fly-fishing and golf.


Dr. Anthony LandisAnthony M. Landis, DO
Anthony M. Landis, DO, earned his medical degree from the Philadelphia College of Osteopathic Medicine. He completed post-graduate training in internal medicine at Wilmington Medical Center. At the Emory University School of Medicine, Dr. Landis completed a fellowship in hematology and medical oncology.

Dr. Landis is board-certified in internal medicine and medical oncology. He is an active member of several professional medical organizations, including the American Society of Clinical Oncology, the Gwinnett Forsythe County Medical Association, the Clinical Oncology Association of Georgia, the Medical Association of Georgia and the Georgia Society of Clinical Oncology.

Dr. Landis serves on the board of directors of the American Cancer Society of Gwinnett County (Eastern Chapter). Previously, he served as the chairman of the Cancer Committee at Gwinnett Medical Center, the chairman of the board of directors for the Gwinnett Division of the American Cancer Society and the president of the medical staff of Gwinnett Hospital System.

Dr. Landis is married with two children. He enjoys playing golf.


Dr. Aldemar Montero MDAldemar Montero, MD
Aldemar Montero, MD, joins Suburban Hematology-Oncology Associates after a four-year residency program in medical oncology and hematology at the National Cancer Institute. He also completed his internship and residency at the University of Conneticut.

He has been published in various leading medical journals. We are excited to have him join our practice and help continue to grow our clinical trials program. He is board-certified in internal medicine, medical oncology and hematology.

Dr. Montero is married with two children. He enjoys playing soccer as well as the violin.


Dr. Kevin PeacockKevin H. Peacock, MD
Kevin H. Peacock, MD, earned his medical degree from the Medical College of Virginia. After completing his medical residency, he did his fellowship in hematology oncology at the Wake Forest University School of Medicine. He stayed on as faculty at Wake Forest for three years following his residency.

Dr. Peacock is board-certified in internal medicine, hematology and medical oncology. He is an active member of both the American Society of Hematology and American Society of Clinical Oncology. Dr. Peacock served as a member of the Wake Forest Hematology/Oncology Fellowship committee for more than two years and previously held the position of Cancer Committee chairman of Rockdale Medical Center.

Dr. Peacock is married and has two children. His hobbies include golf, running and soccer.


Dr. Alexander Saker, Jr.Alexander Saker, Jr., MD
Alexander Saker, Jr., MD, earned his medical degree from the Medical College of Georgia and completed post-graduate training at the University of South Florida. He completed his fellowship in medical oncology and hematology at the University of South Florida at H. Lee Moffitt Cancer Center and Research Institute as well as Emory University.

Dr. Saker is board-certified in internal medicine, medical oncology and hematology. He is an active member of several professional medical organizations, including the American Society of Clinical Oncology, the Georgia Medical Society and the American College of Physicians.

Dr. Saker serves as a member of the Cancer Committee and Blood Utilization Committee at Gwinnett Medical Center. Dr. Saker is married and has three children. He enjoys gardening and softball.


Dr. P. Ravi SarmaP. Ravi Sarma, MD
P. Ravi Sarma, MD, earned his medical degree from Andhra Medical College (India). He completed post-graduate training in Internal Medicine at Cook County Hospital. He completed his fellowship training in hematology and medical oncology at Emory University Hospitals and University of Illinois Hospitals.

Dr. Sarma is board-certified in internal medicine, hematology, medical oncology and geriatric medicine. He is an active member of several professional medical organizations, including the American Society of Clinical Oncology, the Dekalb Medical Center Cancer Committee and the Transfusion Committee at Eastside Medical Center. Dr. Sarma is a founding member of the Georgia Society of Clinical Oncology and a fellow of the American College of Physicians.

Dr. Sarma served as an associate professor of medicine in the Department of Hematology-Oncology at the Emory University School of Medicine until 1995.

Dr. Sarma is married with three children.


Sativr Singh, MDSativr Singh, MD
Sativr Singh, MD, performed a three-year fellowship at East Carolina University. Prior to his fellowship, Dr. Singh was a specialist in internal medicine at Pitt County Memorial Hospital. He also served as the chief of the Department of Internal Medicine at Sampson Regional Medical Center.

Currently, Dr. Singh is board-certified in internal medicine, medical oncology and hematology, and has twice won awards as an outstanding physician in patient satisfaction.

Dr. Singh is married and has two children.