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Meet Our Team

 x To schedule an appointment with one of our oncologists, call 530.576.5298

Hematology – Oncology

Dignity HealthAlborz Alali, MD
A graduate of Yale Medical School, Dr. Alali is an oncologist with 25 years experience.




Dignity HealthSonia Reichert, MD
A graduate of Our Lady of Fatima School of Medicine and SUNY Downstate Medical Center, Dr. Reichert is an oncologist focused on treating the whole patient, including body, mind and spirit.




Dignity HealthJohn Schwerkoske, MD 
A graduate of Creighton University School of Medicine, Oncologist Dr. Schwerkoske is also board certified in Internal Medicine.




General Surgery

Dignity HealthNatasha Bir, MD 
A graduate of Harvard University (Undergraduate); Johns Hopkins School of Public Health (Master’s Degree); and University of California – Davis (Medical Degree), Dr. Bir is a general surgeon with a special interest in the surgical treatment of cancers of the breast, colon and lung.



Dignity HealthThomas J. Magrino, MD 
A graduate of Rensselaer Polytechnic Institute (Undergraduate); and New York Medical College (Medical Degree), Dr. Magrino is a general surgeon specializing in colon and rectal surgery.



Dignity HealthRiaz Shah, MD 
A graduate of Aga Khan Medical College (Medical Degree), Dr. Shah is a general surgeon.




Dignity HealthKaren Win-Vroom, MD
A graduate of University of California - Berkeley (Undergraduate) and University of Pittsburgh (Medical Degree), Dr. Win-Vroom is a general surgeon focused on laparoscopic surgery and surgery for treatment for diseases of the breast, thyroid and parathyroid.



Radiation Oncology

Dignity HealthMelissa Lemieux, MD
A graduate of Stanford University School of Medicine, Dr. Lemieux aims to provide comprehensive care tailored to each individual.




Dignity Health

Ellen Wiegner, MD
A graduate of Stanford University School of Medicine, Dr. Wiegner’s goal is to provide compassionate, state-of-the-art cancer care to her patients.