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Dr. Nissenson

Allen R. Nissenson, MD, FACP

Dr. Nissenson is Emeritus Professor of Medicine at the David Geffen School of Medicine at UCLA, where he has served as director of the dialysis program and associate dean. Dr. Nissenson is former President of the Renal Physicians Association and served on the RPA Board of Directors as a special advisor to the president. Dr. Nissenson’s major research interests focus on the quality of care for chronic kidney disease patients, including issues of health policy, health care delivery and economics, anemia management, and the impact of anemia on brain and cognitive function.



Susie J., MS, ARNP, CNN

Susie is currently the Vice President of Clinical Education. She has been a nephrology nurse for 28 years and has a master’s degree in nursing and is an adult nurse practitioner. She has been a nephrology nurse educator for 19 years and with DaVita for 8 years.


Margo W., RN

Margo is a registered nurse with more than 20 years nursing experience. In 2009, she started her thirteenth year in dialysis nursing. She has been doing chronic kidney disease education for more than three years. Margo is married with three children and six grandchildren (and counting).


Debra M., RN, MSN, FNP-C, MBA

Debra is a registered nurse practitioner, practicing in a renal disease management program as an educator in training and development in VillageHealth. She received her associate's degree in nursing from River College St. Joseph School of Nursing in Nashua, NH, and a master's of science degree as a family nurse practitioner. She also received a master's in business administration from the University of Central Florida in Orlando. Debra has been practicing nephrology since 1995. 


Amy T., RD

Amy has been a renal dietitian with DaVita since 2001. She obtained her bachelor’s degree in nutritional science at California Polytechnic State University in San Luis Obispo, CA and completed her dietetic internship in Napa, CA. Amy enjoys the ongoing relationships with her kidney patients, helping them achieve their goals and celebrating successful lifestyle changes.


Lisa B., RD, CSR, LDN

Lisa is a registered dietitian and board certified specialist in renal nutrition. She is a DaVita dietitian in Massachusetts and divisional lead dietitian for Northern Lights, which includes Massachusetts, Connecticut and New Hampshire. Lisa is a member of the National Kidney Foundation's Council on Renal Nutrition.


Mary Kay H., MS, RD, CSR

Mary Kay has provided nutrition care to kidney patients since 1968. She has seen many changes over the years and has worked with countless hemodialysis, peritoneal dialysis and CKD Stage 3 and 4 patients to help them improve their health by eating right. She has volunteered and served in leadership positions for the National Kidney Foundation, the Kidney Foundation of Illinois and Indiana, the American Dietetic Association, and the International Society of Renal Nutrition and Metabolism. Mary Kay grew up on a farm in Nebraska and is still an avid gardener.

Jean S., RD, LD

Jean is a registered and licensed dietitian in Ohio. She has worked as a renal dietitian since 1988 and has extensive expertise in renal nutrition and hemodialysis. She currently works for DaVita.  She enjoys getting to know her patients and helping them transition to dialysis by optimizing their diet and maintaining good health. Jean is married and has three teenagers. She enjoys cooking, hiking, kayaking and going to wine tastings.

Social workers

Maureen Y., MSW, LSW

Maureen has been a nephrology social worker since 1996. Prior to that she was a rehabilitation counselor and worked in a hospital setting for 6 years. Maureen attended The University of Pittsburgh for both undergraduate and graduate school, graduating from both programs with high honors. She is a member of NASW, CNSW and is a licensed social worker. She has been married for 18 years and has two children. She enjoys all types of music, taking long walks, and spending time with friends and family.


Kris P., LCSW

Kris is a licensed and board certified diplomate in clinical social work. She has been working as a nephrology social worker since 1987. Kris got her bachelor’s degree in psychology from Loyola Marymount University and her master's degree in social work from San Diego State University. She is  a divisional lead social worker for DaVita.

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