Our Team

Meyeon Park

Clinic Director: Meyeon Park, M.D., M.A.S. (Nephrology)

Meyeon Park’s research focuses on the impact of cardiovascular disease on patients with kidney disease of varying stages and in patients with polycystic kidney disease and recipients of kidney transplants. She is interested in biomarkers and imaging techniques to better predict kidney and cardiovascular disease. Park graduated magna cum laude with a biology degree from Harvard College and earned her medical degree from the University of Pennsylvania School of Medicine. She completed her residency in internal medicine at Yale-New Haven Hospital in New Haven, Connecticut, and her nephrology fellowship at UCSF, where she also earned a master of advanced studies degree in clinical research and epidemiology. She is a recipient of career development awards from both the National Institutes of Health and the Doris Duke Charitable Foundation.

Chi-yuan Hsu

Chi-yuan Hsu, M.D., M.Sc. (Nephrology)

The overarching theme of Dr. Hsu's research relates to the study of patients with chronic kidney disease. Previous projects have refined understanding of causes of chronic kidney disease (such as obesity, diabetes and hypertension) and defined consequences of chronic kidney disease (such as anemia, cardiovascular disease and acute kidney injury). Current areas of interest include the impact of acute kidney injury on the course of chronic kidney disease and examining the transition from chronic kidney disease to end-stage renal disease. Dr. Hsu also engages in collaborative translational research of biomarkers in kidney disease.


Stephen Gluck

Stephen Gluck, M.D. (Nephrology)

Dr. Gluck is an eminent scientist and nephrologist, who earned his medical degree at the University of California, Los Angeles and completed his internal medicine residency and nephrology fellowship at Columbia Presbyterian Medical Center. He is a Full Professor at the University of California, San Francisco and has been awarded the “Top Doctor” award from San Francisco Magazine on numerous occasions.


Brian Lee

Brian Lee, M.D. (Nephrology)

Dr. Brian Lee was born and raised in Hong Kong, where he received most of his formative education. Upon graduation, he proceeded to study medicine in Dublin, at the Royal College of Surgeons in Ireland, graduating in 2000.

He underwent an internal medicine residency at the Case Western Reserve University (CWRU) followed by a nephrology fellowship from 2005 – 2007. In July of the same year Dr. Lee began his transplant nephrology fellowship at UCSF, and joined the faculty by 2008.

His memberships in professional organizations include the American Medical Association, American Society of Transplantation, American Society of Hypertension, American Society of Nephrology, and Renal Physicians Association.

As a transplant nephrologist and associate clinical professor in medicine at UCSF, Dr. Lee’s current areas of interest include advocacy for living kidney donation, and evaluation of living donors. Dr. Lee’s research interests involve managing a database for new onset diabetes mellitus after kidney transplant and its implications in transplant and patient outcomes.

Chris Freise

Chris Freise, M.D. (Transplant Surgery)

Dr. Christopher E. Freise is a member of the UCSF Transplant Service with particular interest in adult and pediatric liver and kidney transplants, surgery for liver tumors and kidney cysts, laparoscopic surgery for the liver and gall bladder, and surgery for dialysis access. In his research, he addresses immunosuppressive drugs used after transplantation and methods to prevent ischema-reperfusion injury or tissue damage after blood supply is restored. His research is recognized and funded by the National Institutes of Health and the American Society of Transplant Surgeons.

Dr. Freise earned a medical degree at the University of Minnesota, where he completed a residency in surgery. He completed a postdoctoral fellowship in transplant surgery at UCSF Medical Center. He is certified by the American Board of Surgery and is a fellow of the American College of Surgeons.

Mary Ellen DiPaola

Mary Ellen DiPaola, R.D., C.D.E. (Registered Dietitian)

Mary Ellen DiPaola is a dietitian, certified diabetes educator and board-certified lactation consultant. She provides nutrition therapy for chronic kidney disease, diabetes, weight management and bariatric surgery, cardiac and gastrointestinal disorders, as well as women's health, obstetrics, and childhood feeding issues.

At UCSF, DiPaola sees patients at the Nutrition Counseling Clinic, Pre-Kidney Transplant Clinic, the Bariatric Surgery Center, the Polycystic Ovarian Syndrome Clinic, The Young Women's Clinic and the adult diabetes practice. DiPaola received her Bachelor of Science degree in nutrition and dietetics from the University of Delaware and completed an internship at University of Indiana/Purdue University Medical Center.

Kathryn Drexler

Kathryn Drexler, M.S. (Genetic Counselor)

Kathryn Drexler is a genetic counselor in the Prenatal Diagnosis Center. She earned her master's degree in biophysics and human genetics from the University of Colorado Health Sciences Center. She is certified by the American Board of Genetic Counseling.

Drexler worked in the Rocky Mountain Regional Genetics Program before coming to UCSF. She has worked in UCSF's Reproductive Genetics Clinic since 1984.


Danielle Brandman

Danielle Brandman, M.D., M.A.S. (Hepatology)

Dr. Danielle Brandman is an Assistant Professor of Medicine and hepatologist, specializing in treating patients needing liver transplants. Her research interests include nonalcoholic fatty liver disease and post-transplant metabolic syndrome. She engages in outcomes-based research with a special interest in NAFLD and liver transplantation: the post-transplant outcomes of patients with NAFLD, selection of patients with NAFLD for transplant, recurrence of NAFLD following transplant, and new-onset NAFLD after liver transplantation for other causes of liver disease

Dr. Brandman received her medical degree at UMDNJ New Jersey Medical School in 2005. She continued her medical training at University of California, San Francisco, where she completed her residency, gastroenterology fellowship, transplant hepatology fellowship, and master's degree in clinical research. Dr. Brandman is certified by the American Board of Internal Medicine in internal medicine and gastroenterology. She is a member of the American Association for the Study of Liver Disease (AASLD).

Melissa Rosenstein

Melissa Rosenstein, M.D., M.A.S. (Maternal Fetal Medicine)

Dr. Melissa Rosenstein earned her medical degree from the University of Pennsylvania School of Medicine. She completed her residency in Obstetrics and Gynecology at the University of California, San Francisco. After graduating, she completed a three-year fellowship in Maternal-Fetal Medicine at UCSF during which she also received her Master’s Degree in Clinical Research. She is board certified in Obstetrics and Gynecology and is a member of the Society for Maternal-Fetal Medicine.


Hakan Cakmak

Hakan Cakmak, M.D. (Reproductive Endocrinology and Infertility)

Dr. Hakan Cakmak received his medical degree from Istanbul University, Cerrahpasa School of Medicine, Turkey. He completed his residency in Obstetrics and Gynecology at Yale University. He subsequently received his fellowship training in Reproductive Endocrinology and Infertility at University of California, San Francisco. Dr. Cakmak is board certified in Obstetrics and Gynecology, and is a member of the American Society of Reproductive Medicine and Society of Reproductive Endocrinology and Infertility.

Dr. Cakmak has special interest and clinical expertise in assisted reproduction, fertility preservation, endometriosis, pelvic pain and minimally invasive surgery including laparoscopic/hysteroscopic surgery. He has over 40 publications in leading scientific journals in the fields of infertility, assisted reproduction, fertility preservation, assessment of egg quality, endometriosis and implantation.

Thomas Chi

Thomas Chi, M.D. (Urology)

Dr. Thomas Chi, MD, graduated as a President's Scholar from Stanford University with a Bachelor of Arts in Human Biology as well as Masters degrees in both Sociology and Music. He went on to earn his medical degree from the University of California, San Francisco School of Medicine. After graduating, he completed two years of general surgery residency training and then a urology residency at UCSF. After completing his Chief Resident year in the Department of Urology, he continued on to finish a fellowship in Endourology and Laparoscopy under the mentorship of Dr. Marshall L. Stoller.

During his fellowship, Dr. Chi was awarded grant funding from the National Institutes of Health and the American Urological Association Urology Care Foundation to research the fundamental mechanisms underlying the formation of urinary stones. He developed a novel model for the study of kidney stones utilizing the common fruit fly, Drosophila melanogaster.

Atif Qasim

Atif Qasim, M.D., M.S.C.E. (Cardiology)

Atif Qasim, M.D., MSCE is an Assistant Professor in the Division of Cardiology at the University of California, San Francisco (UCSF). He earned his M.S./B.S. in Biochemistry and Biophysics at Yale University and earned his M.D. degree at the Johns Hopkins University School of Medicine. He completed his medical internship, residency, chief residency and cardiology fellowship at the Hospital of the University of Pennsylvania, where he also served as chief resident. During his cardiology fellowship, Dr. Qasim received advanced training in multimodality imaging and earned a master’s degree in clinical epidemiology. While at Penn he worked in the labs of Drs. Muredach Reilly and Dan Rader in the Institute for Translational Medicine and Therapeutics on projects related to the genetics of atherosclerosis and the use of non-invasive imaging in preventive cardiology. He joined the University of California, San Francisco cardiology faculty in 2012.

Donald Grandis

Donald Grandis, M.D. (Cardiology)

Don Grandis graduated Virginia Commonwealth University/Medical College of Virginia in 1985. He received training in Internal Medicine and Cardiology at the University of Pittsburgh Medical Center. He practiced cardiology in Pittsburgh, PA for over 20 years as an Interventional Cardiologist. He joined the faculty at UCSF in March 2015. Here, he is practicing General Cardiology with a focus on using digital technology to help manage hypertension. He also has an interest in the interaction between heart disease with both renal and liver disease.


Jane Wang

Jane Wang, M.D. (Radiology)

Z. Jane Wang, MD, received her undergraduate degree in Electrical Engineering from Brown University, and her medical degree from Northwestern University Medical School. She completed her residency training in Diagnostic Radiology at the University of California, San Francisco, during which time she also served as a Chief Resident from 2006-2007. Dr. Wang subsequently completed a fellowship in Abdominal Imaging at the University of California, San Francisco.

Dr. Wang’s research interests primarily focus on identification of novel imaging techniques and their development into practical and clinically useful diagnostic tools, with a particular emphasis on renal tumors and diffuse renal disease. One of Dr. Wang’s current research endeavor is to use hyperpolarized 13C MR spectroscopic imaging (MRSI) to assess renal tumor aggressiveness. She has also been studying functional imaging using MR and CT of diffuse renal disease. She is the recipient of several grants, including Department of Defense Peer Reviewed Cancer Research Program Concept Award, Radiological Society of North America (RSNA) Scholar Grant, and RSNA Fellow Grant.

George Pasvankas

George Pasvankas, M.D. (Pain Management)

Dr. George W. Pasvankas is an attending physician at the UCSF Pain Management Center, where he treats patients with chronic pain, including cancer pain, chronic neck and low-back pain, neuropathic pain syndromes and complex regional pain syndrome. He also cares for patients undergoing anesthesia for surgery, including preoperative assessment and management, intraoperative anesthetic management and postoperative management and recovery.

Pasvankas is a member of the American Society of Anesthesiologists and California Society of Anesthesiologists. He earned a medical degree at the Icahn School of Medicine at Mount Sinai in New York, followed by a residency in anesthesiology at Massachusetts General Hospital and a fellowship in pain medicine at UCSF. Pasvankas serves as director for the UCSF Pain Medicine Fellowship Program and is an associate professor of medicine at UCSF.

Jennifer Ashby, DOAM (Acupuncturist)

Dr. Jennifer Ashby, DAOM has practiced Traditional Chinese Medicine since 1996. She earned her master’s degree in Traditional Chinese Medicine in 1995 from the American College of Traditional Chinese Medicine (ACTCM) and her Doctorate of Acupuncture and Oriental Medicine from ACTCM in 2010. She has been in practice at The Lotus Center in San Francisco since 1996.

Dr. Ashby has taught Women’s Health at ACTCM since 2001. She has also worked as a research assessor for three years at Stanford University, on a study researching the effects of acupuncture on depression. She has been an addiction recovery and detoxification specialist since 1994, and has treated inmates in the San Francisco County Jails for addiction, using acupuncture treatments. She completed her doctoral residencies at Marin General Hospital and Shanghai University Hospital.

Jennifer has guest lectured at UC Berkeley and the San Francisco Doula Group, as well as ACTCM, where she was the keynote speaker for their 2012 graduation ceremony. She has been at the Osher Center since 2014.

Sarah Doernberg

Sarah Doernberg, M.D. (Infectious Diseases Specialist)

Sarah Doernberg is an Assistant Clinical Professor of Medicine in the Division of Infectious Diseases and the Medical Director of Adult Antimicrobial Stewardship at UCSF Medical Center. She has an active outpatient Infectious Diseases Clinic and sees inpatients on the Transplant Infectious Diseases service. Her clinical research focuses on healthcare-acquired infections and antimicrobial stewardship.

She received her BA from Harvard University in Biology with a focus in Neurobiology and received her MD from Yale University School of Medicine. She completed her Internal Medicine residency and Infectious Diseases fellowship at UCSF. She also received a Masters’ degree in advanced studies through the Training in Clinical Research Program at UCSF.

Tea Chan

Tea V. Chan, B.A., CPT-1 (Nephrology)

Tea Chan is a clinical research coordinator and a certified phlebotomist in the Division of Nephrology and Division of Endocrinology and Metabolism. She earned her bachelor’s degree in Molecular Cell Biology at University of California, Berkeley with an emphasis in Cell and Developmental Biology.

Tea joined the UCSF PKD Center of Excellence in 2015. She coordinates and manages data and protocols for three phase II clinical trials and several observational trials for Dr. Meyeon Park and Dr. Edward Hsiao. Her research interests include improving well-being of patients with polycystic kidney disease through various lifestyle changes. Tea is excited to help make an impact in the PKD community by assisting Dr. Park in her research endeavors to improve the overall quality of life for patients with this debilitating disease.