NCHOC saved My Life I couldn't have been in better hands Six years later I am still in remission I have received superb care throughout the years
Dr. Gary Cecchi
Gary Cecchi M.D.
A board certified medical oncologist, hematologist and internist who has practiced medicine in the East Bay for more than 23 years. He along with Dr. David Irwin and Dr. Martha Tracy founded Northern California Hematology and Oncology, Inc. (NCHOC) in 2004 and since then the group has grown significantly to encompass 12 practitioners in 9 hospitals and 7 offices. NCHOC encompasses not only traditional Hematology and Medical Oncology, but has expanded to include medical research, Integrative Medicine, acupuncture, botanical therapy, and Wound and Ostomy Care. The group is involved with many medical research projects in both traditional Hematology and Medical Oncology, and in Integrative Medicine focusing on acupuncture and botanical therapy.

In addition to being the managing partner for NCHOC, Dr. Cecchi wears many other hats. He is the Medical Director for the Hematology and Medical Oncology at the Alta Bates Summit Medical Center , Summit Campus; Director of the Lung Cancer and Lung Cancer Screening program at the Alta Bates Summit Medical Center for all campuses; Director for the Cancer and Infusion Services at Alameda Hospital. Dr. Cecchi is a medical director for a number of independent practice associations functioning in the Bay Area as well as a medical examiner for the Federal Aviation Administration. His interest in medicine encompasses all areas of Medical Oncology and Hematology, especially as oriented toward patient care.

Outside of medicine, Dr. Cecchi is an accomplished pilot, sailor and diver. He established Grey Fox Vineyards and Winery in the Sierra Foothills more than a decade ago and in his free time can be found amongst the vines, in the winery, or the tasting room. He hosts a yearly party at the winery in June of every year for his patients, staff, and friends.
Dr Gary Cecchi Dr Martha Tracy   Dr Ann Wexler Dr Kanika Sharma
Dr David Irwin Dr Amy Matecki   Dr Jill Chen NP Robin Fernandes
Our Board-Certified Physicians have the training and expertise to meet
each patient's needs. Please select and read about our staff below...
With over 50 yrs of combined medical practice, our highly experience and skilled physicians and staff encompass many backgrounds and have achieved many personal goals. The NCHOC physicians are board certified in Internal Medicine and include members of the American Society of Clinical Oncology (ASCO), the American Society of Hematology (ASH), California Medical Association, American Academy of Hospice and Palliative Medicine.


Dr. Jill Chen
Jill Chen M.D.

Growing up in Shanghai China, Dr Chen's childhood experience compelled her to pursue a career in medicine. From an early age, she became very sympathetic to people who were sick and had no access to medical care. In 1980 she was admitted to Shanghai Second Medical University (SSMU), and completed eight years of training in medicine. Later she became an attending physician at Ren Ji Hospital affiliated with SSMU, one of the best hospitals in China.

Arriving in the United States as a visiting scholar at University of California, San Francisco School of Medicine, her research on cardiovascular diseases led to publications in several prominent scientific journals including Nature and Journal of Biological Chemistry. In 2000 Dr Chen began her residency at the Alameda County Medical Center became Board Certified in Internal Medicine in 2004 and continues to practice as a primary care physician. Working with geriatric, cancer and under served patients offers her the best opportunity to achieve her goal: helping people who need the help the most.

Complementing her training in modern medicine, Dr Chen received extensive Traditional Chinese Medicine (TCM) training at the Shanghai University of Traditional Chinese Medicine and at the Academy of Chinese Culture and Health Sciences. She enjoys being able to treat a variety of medical conditions in adult patients by integrating Western and Eastern medicine.  Over the course of her practice, she developed a special interest in Integrative Oncology while doing clinical study at the Department of Oncology in Long Hua Hospital China - a leading TCM hospital integrating TCM and Western medicine to best serve cancer patients.

Dr Chen appreciates the opportunity to combine her expertise in TCM and Western medicine and research in USA to most effectively care for and support each individual patient.

Dr. Ann Wexler
Ann Wexler M.D.

Dr Ann M. Wexler, is Board Certified in Internal Medicine, Medical Oncology and Hematology. She has been in private practice for 3 years. Dr. Wexler attended Medical School at the University of Texas Health Science Center at San Antonio completing her internship and residency training at St. Vincent’s Hospital in New York.

Following this training, she completed a Medical Oncology and Hematology Fellowship at St. Vincent’s Comprehensive Cancer Center in New York. She is the principal and secondary author of three publications, one of which is the Textbook of Uncommon Cancer, 3rd edition. She is fluent in Spanish and enjoys traveling and spending time with her dog, Chelsea.



N.P. Robin Fernandes
N. P Robin Fernandes

Having been an Oncology nurse for the past six years Robin Fernandes considers herself a late bloomer. Never too late she received her post graduate training at Cal State and Samuel Merritt College in Oakland, CA and is preparing for advanced certification as an Oncology Nurse Practitioner.

Growing up in North and South Carolina she moved to California in 1989, and with her two children and husband live in Castro Valley. When not taking care of patients she is busy parenting and taking care of her mom. She is proud of her daughter becoming quite an equestrian, and her son like his dad, enjoying sports.

As a loving mother spending time with family, her dedication and commitment to the NCHOC is a passion to the continued care and excellence of your medical team.

Dr. Martha Tracy
Martha Tracy M.D.
Originally from New England Dr Tracy has been practicing medicine in California for over 25 years. A graduate from Harvard Medical School and a licensed pilot she along with Dr Gary Cecchi and Dr David Irwin founded the NCHOC. She enjoys traveling, photography, baking, Bluegrass, and the Rolling Stones. "I miss the seasons and the New England fall, but have adapted to calling the rainy season here Winter ".
Dr. Amy Matecki
Amy (Ying Li) Matecki M.D
Dr Matecki graduated from Qingdao Medical College in 1989 and Qingdao Acupuncture Academy in 1991 where she was certified in Chinese Acupuncture and Herbal Medicine.  She practiced both Western and Traditional Chinese Medicine in China before moving to California in 1994. Dr. Matecki became licensed to practice medicine in California in 2002, and in 2004 completed her Internal Medicine residency program as Chief Resident of Alameda County Medical Center, became Board Certified in Internal Medicine, joined Northern California Hematology and Oncology, Inc. and added the acupuncture program to the Alta Bates Summit Comprehensive Cancer Center Complementary Therapies Program.

Dr. Matecki is currently the principal investigator on acupuncture research for chronic post-chemotherapy fatigue in collaboration with Memorial Sloan-Kettering Cancer Center in New York, the Medical Director for the Center for Integrative Medicine, Alta Bates Summit Medical Center, and frequently travels to China to develop collaborations and training programs to bring the best of Eastern medicine into Western practices.

Integrating Chinese medicine into conventional oncology practice, Dr. Matecki finds that using integrative medicine stimulates the body’s natural ability to heal, often reduces the pain and nausea which frequently accompany chemotherapy, and provides essential post-treatment support. 

For more information on Dr. Matecki’s research, see the National Institutes of Health web site at
Dr. David Irwin
David Irwin M.D.
Dr. David Irwin is a board certified medical oncologist and internist who has practiced medicine in the East Bay for more than 16 years.  He, along with Dr. Gary Cecchi and Dr. Martha Tracy founded Northern California Hematology Oncology Consultants, Inc (NCHOC, Inc.) in 2004.  Since then, the group has grown significantly to include 12 practitioners in six hospitals.  NCHOC encompasses not only traditional hematology and medical oncology, but has expanded to include medical research, integrative medicine, acupuncture and wound and ostomy care.  The group is involved with many medical research projects in both traditional hematology and medical oncology and integrative medicine focusing on acupuncture and botanical therapy.

In addition to being one of the managing partners of NCHOC, Dr. Irwin has been the Director of the Clinical Research Program at the Alta Bates Comprehensive Cancer Center for 16 years and the Executive Director of the Western Division of the Sutter Research network.  For 9 years he has served as the Principal Investigator for over 60 clinical research trials and he is co-author on over 60 research papers.  He is also Clinical Instructor of Hematology and Oncology at the Alameda County (Highland) Hospital where he teaches medical students and residents every day.  He also serves as Medical Director of clinical oncology at Doctors Hospital in San Pablo where he has been proud to work for the past 5 years.  His interest in medicine encompasses all areas of medical oncology and hematology but especially areas of clinical research and medical education.

Outside of medicine, Dr Irwin is the proud husband of Dr. Carmela Romano, a general internist at Kaiser Richmond. They have two children, Christopher and Gianna.  He is a proud Penn State Alumni who fervently routs for both the Nittany Lions and the Cal Bears in the fall and the Phillies and the A’s in the summer. He enjoys gardening year round, English literature and history, collecting vintage baseball cards and books.  He loves to travel with his family and hopes to attend the World Cup in South Africa in 2010.

Kanika Sharma M.D.

Graduating from the Louisiana State University School of Medicine, Kanika Sharma completed her internal medicine residency at the Highland Campus of UCSF, where she served as a chief resident. She began her career in the hospital based medicine in 1996, at the inception of this medical specialty, and was on the board of one of the bay area's first hospitalists groups. She also spent many years teaching inpatient medicine at Highland General Hospital.

Dr Sharma now provides NCHOC's hospitalized patients with comprehensive medical care while working closely with their primary oncologist. In her comprehensive medical care while working closely with their primary oncologist. In her free time she enjoys cooking, photography and building train tracks with her son.