Allan Freedman, MD

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Allan Freedman, MD

Allan Freedman, MD earned his medical degree from the University of Vermont (Burlington, Vermont) and completed post-graduate training at Grady Memorial Hospital (Atlanta, Georgia). He completed his fellowship in Medical Oncology and Hematology at the Emory University Hospital (Atlanta, Georgia).

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, the Georgia Society of Clinical Oncology and a Board Member of the Georgia Cancer Pain Initiative.


Alexander Saker, Jr., MD

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Alexander Saker, Jr., MD

Alexander Saker, Jr., MD earned his medical degree from the Medical College of Georgia (Augusta) and completed post-graduate training at the University of South Florida (Tampa, 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 and also at Emory University (Atlanta, Georgia).

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 the Gwinnett Medical Center. He also serves on the Board of Directors of the American Cancer Society (Gwinnett County Division).

Dr. Saker is married and has three children. He enjoys gardening and softball.


P. Ravi Sarma, MD

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P. 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 (Chicago, Illinois). He completed his fellowship training in Hematology and Medical Oncology at Emory University Hospitals (Atlanta, Georgia) and University of Illinois Hospitals (Chicago).

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.


Christopher Hagenstad, MD

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Christopher 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.


Satvir Singh, MD

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Satvir Singh, MD

Dr. Singh comes to Suburban after 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.

Dr. Singh has twice won awards as an outstanding physician in patient satisfaction.

Dr. Singh is married and has two children.


Aldemar Montero, MD

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Aldemar Montero, MD

Dr. Montero joins Suburban Hematology Oncology after a four year residency program in Medical Oncology and Hematology at the National Cancer Institute.

Internship and Residency: University of CT (1999 to 2002)

Fellowship: National Institute of Health/National Cancer Institute since 2002 in Bethesda, Maryland.

He has been published numerous times 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.


Kevin Peacock, MD

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Kevin Peacock, MD

Dr. Peacock earned his medical degree from Medical College of Virginia. After completing his medical training he did his fellowship in Hematology at Wake Forest University School of Medicine in Winston-Salem, North Carolina.

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 over 2 years and previously held the position of Cancer Committee Chairman of Rockdale Medical Center.

Dr. Peacock is married and has 2 children. His hobbies include golf, running, and soccer.

 


Mohan Krishnamachary, MD

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Mohan Krishnamachary, MD

Mohan Krishnamachary, MD is a dedicated and enthusiastic medical professional that is a board certified Hematologist Oncologist. He joined Suburban Hematology-Oncology after gaining strong ties to the community while practicing in a private oncology practice in Athens Georgia. Dr. Krishnamachary is also board certified in Geriatric Medicine and Internal Medicine. He earned his medical degree from Kakatiya Medical College (India) in 1996, where he practiced as an Internist in private practice until 2001, before traveling to the United States. He completed his Internal Medicine fellowship at the University of Wisconsin in 2007 and later his Hematology-Oncology fellowship at the University of Kansas in 2011. He is an active member of the American Society of Clinical Oncology, American Society of Hematology, American Geriatrics Society and American Medical Association.

Dr. Krishnamachary is married and his wife, a physician herself practices as a Nephrologist. He has two children, a son and daughter. He loves wildlife and enjoys spending his time studying their ecology, especially bears and wolves as he has spent time studying their hibernation habits with scientists from the University of Wisconsin. He is a member of the Timber Wolf Information Network.

Praveen Sivakumaran, MD

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raveen Sivakumaran, MD

Dr. Sivakumaran received his medical degree from the Wayne State University School of Medicine in Detroit, MI.  After medical school, he continued his medical education at Wayne State where he completed his residency in internal medicine.   He then did a fellowship in Transfusion Medicine at Cedars-Sinai Medical Center (Los Angeles, CA) before returning to the east coast to complete his fellowship in hematology-oncology at Georgetown University/Medstar Washington Hospital Center in our nation’s capital.

Dr. Sivakumaran is board-certified in hematology and oncology, as well as internal medicine.  He is well-versed in treating all types of malignancies and has presented at numerous conferences, including the annual ASCO (American Society of Clinical Oncology) meeting in Chicago, IL.  He is married and has deep roots in the south, growing up in nearby Florida.  His hobbies include basketball and running.

Nurse Practitioners

Wan Yang, NP-C

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Wan Yang, NP-C

Wan earned his nursing degree from the University of Wisconsin – La Crosse in 1990 after coming to America from Shanghai, China to pursue an education. He enjoyed an internship at St. Helena Hospital located in the beautiful Napa Valley and later moved to Memphis, TN and became a U.S. citizen. In 2008 after moving to Atlanta, GA and working at Northside Hospital, he decided to go back to school to earn his Nurse Practioner degree. In 2010 he graduated from North Georgia State College and University and is now a nurse practioner and proud member of the Suburban Hematology and Oncology family. He is married with a son and a daughter. He enjoys traveling to different parts of the United States and spending time in the mountains.


Barbara O’Callaghan

After spending her twenties and most of her thirties as a stay at home mother, and part-time student, Barbara earned her Bachelor of Science in Nursing degree from Emory University in 1998.  She received her Master of Science in Nursing degree from Kennesaw State University in 2008. She has been a part of Suburban Hematology Oncolgy for most of her nursing carrier; first as a nurse and now as a practitioner.

Barbara is married with three daughters and one son. Her hobbies include reading, biking, and spending as much time as possible with her three grandsons. And her favorite son-in-law Charles.