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Gyn Onc Team Members

From Left to right: Raushan Rozenberg, RN, Christine Oeur, RN, Pauline Beggs, RN,
Mercedes Rose, NP, and Jenille Rimando, RN

Mercedes Rose, NP
Mercedes Rose is a nurse practitioner who cares for women with gynecologic malignancies, including cervical, endometrial, ovarian, and vulvar cancers. She collaborates with a multidisciplinary team to provide personalized, comprehensive care to patients during all stages of treatment, including diagnosis, surgery, radiation and chemotherapy.

Mercedes earned her bachelor's degree in nursing from UCSF and her master's degree in nursing from the University of California, Los Angeles. She is a member of the Oncology Nursing Society. She has more than 20 years of nursing experience and has worked at UCSF since 2008.

Melissa Mark, NP (Not pictured)
Melissa Mark is an inpatient nurse practitioner with the Gynecologic Surgical Oncology department. She graduated with her BS in Nursing from Rutgers University in NJ and received her Master's in Nursing at Thomas Jefferson University in Philadelphia, PA. She primarily works on the Adult Acute Care unit at Mission Bay providing comprehensive care for patients with gynecologic malignancies. This includes post-operative management, chemotherapy, and symptom management. Melissa's background includes internal medicine and critical care. She is the recipient of the 2014 UCSF Mount Zion Palliative Care Service Award and the 2017 UCSF Excellence in Oncology Nurse's Week Award.

Brigid Sullivan Barlesi, NP 
Brigid Sullivan Barlesi is a Family Nurse Practitioner who specializes in oncology care since 1997. She has worked in a wide variety of oncology specialties including breast oncology, genitourinary oncology and gynecologic oncology. Currently Brigid cares for women with gynecologic malignancies including cervical, endometrial, ovarian, and vulvar cancers. She collaborates with a multidisciplinary team to provide personalized, comprehensive care to patients during all stages of treatment, including diagnosis, surgery, radiation and chemotherapy.

Brigid went to Dominican College in San Rafael earning her BSN in 1997 and then UCSF for her Master's degree in 2003.

Natalia DeMatteo, NP (Not pictured)
Natalia DeMatteo is an Advanced Oncology Certified Nurse Practitioner with the Gynecologic Oncology department. Natalia worked as a Nurse in Hematology/Oncology for many years at Massachusetts General Hospital before obtaining her Master’s in Nursing at the University of Massachusetts. She then completed an Oncology fellowship for Advanced Practice Providers at Stanford Hospital. She has been at UCSF for 3 years and works at Mission Bay providing patient centered care for those with gynecologic malignancies including ovarian, cervical, endometrial, and vulvar cancers. In her free time she enjoys traveling to visit her nephews and niece, and spending time by the ocean.

Pauline Beggs, RN
Pauline Beggs is a registered nurse in gynecologic oncology at the UCSF Helen Diller Family Comprehensive Cancer Center, where her patients have valued her clinical expertise and warm demeanor for more than 10 years. Additionally, she is highly regarded for the calm, confident way that she works with her newly diagnosed patients and their families. Pauline also skillfully cares for her patients as they progress through treatment and she works with them to mitigate side effects. These skills and her 30 years of nursing experience have helped make her an integral member of the UCSF gynecologic oncology practice. Pauline received her nursing education in the United Kingdom and went on to complete postgraduate training in stress management.

She is the recipient of the prestigious 2011 Ernest H. Rosenbaum, MD Symptom Management Service Commitment to Patient Care Award for her passionate devotion to providing exceptionally high-quality patient care. Additionally, she is a member of the American Holistic Nurses Association, which emphasizes treating the whole person and viewing healing as a partnership between a patient and their practitioner. She is also active in Imagery International and she has lectured around the country on the health and wellness benefits of guided imagery and stress management. Another one of Pauline’s interests is patient education. Each year, she organizes and moderates the “Living with Gynecologic Cancer” events at UCSF. These popular programs raise awareness and bring support to her patients and the community. In addition, Pauline Beggs is one of the honorees of the prestigious the DAISY Award for Extraordinary Nurses in 2016.

Christine Oeur, RN
Christine Oeur is a registered nurse in gynecologic surgical oncology clinic. She holds a Bachelor of Science Degree in Nursing from California State University, Sacramento and currently pursuing a Doctorate in Nursing Practice at University of San Francisco. Christine has worked at UC Davis Comprehensive Cancer Center and Stanford Cancer Center. She has been an oncology nurse for over six years with experience in oncology patient care, chemotherapy and symptom management education. Christine also holds a certification in oncology nursing.

Raushan Rozenberg, RN, BSN
Raushan Rozenberg is a registered nurse in gynecologic surgical oncology clinic. She graduated from Frostburg State University with BSN, worked at Johns Hopkins in a surgery/trauma unit, then at GW in ICU, started oncology specialty in Georgetown university Hospital and continued at UCSF. Currently enrolling in Master’s degree here at UCSF. Adjunct faculty at University of San Francisco School of Nursing and Health Sciences.

Jenille Rimando, RN
Jenille Rimando is a registered nurse in gynecologic surgical oncology clinic. She has been an oncology nurse for over eight years in the inpatient setting but is grateful for the opportunity to carve out the newly-created nurse navigator role in gynecology oncology. Jenille works closely with new patients referred to UCSF helping them navigate the health system from first call to their first appointment. Jenille holds a Bachelor of Arts degree in American Studies and a Bachelor of Science degree in Nursing from Samuel Merritt University.

April Keener, MSW 
April Keener is a clinical social worker who cares for patients with gynecologic cancers. She works as part of an interdisciplinary care team, providing psychosocial support and advocacy for patients, families and caregivers facing the emotional and practical consequences of a cancer diagnosis.

April earned her master's degree from The University of Alabama School of Social Work. April is passionate about social justice and healthcare issues and completed an internship in Washington D.C. where she engaged in legislative policy advocacy with members of Congress and the National Association of Social Workers (NASW). Before joining UCSF, she was at Medstar National Rehabilitation Hospital in Washington D.C.


From left to right: Christina Munsayac, Kevin Anderson, Katherine Bigay, Victoria Onyike, Nathalie Halley

Katherine Bigay, MPH
Katherine is the Clinical Research Manager for the Gynecologic Oncology team who joined in 2019. She is the main point of contact for study start-up and maintenance and manages the Gyn Onc research program. Prior to joining the Gyn Onc team, She has contributed to research at UCSF with the Metabolic Bone Clinic and the Office of Clinical Research. Katherine has a background in chronic health epidemiology and is passionate about working in women's health and contributing to cancer research. Katherine earned a BS in Biology and Anthropology from Haverford College and a Masters of Public Health in Epidemiology from Rutgers University as a USAID Fellow.

Victoria Onyike, BS
Victoria joined the Gynecologic Oncology team as a Clinical Research Coordinator in 2021. She started her research career at Loyola Marymount University conducting environmental chemistry related research regarding the separation of microplastics from beach sand. After graduating with her B.S. in Biochemistry in 2019, she completed a post-baccalaureate program at San Francisco State University in 2020. She gained exposure to clinical research as a scholar in the Clinical Research Coordinator: Learners for Equity (CIRCLE) Training program at UCSF. She is excited to bridge her passion for women’s health with clinical research to enhance the quality of life of people living with gynecologic cancers.

Nathalie Halley, BS 
Nathalie joined the Gynecologic Oncology team as a Clinical Research Coordinator in 2021. Prior to working with UCSF, she completed her studies at San Francisco State University in 2018, obtaining her B.S. in Biology with an emphasis in Human Physiology. She has a diverse background in healthcare with experience working as a Medical Scribe in Obstetrics and Gynecology and Breast Oncology. She most recently worked in Case Management supporting families with Autistic children and young adults in need of behavioral intervention and additional support systems. Nathalie is driven by her passion for patient advocacy and is excited to be working in Women’s Health Clinical Research.

Geo Pineda, BA
Geo joined the Gynecologic Oncology research team in 2020. He works directly with Dr. Chapman on her computational research and as the prime administrator of the UCSF Gynecologic Oncology Tissue Bank. Geo is eager to transfer his bioinformatics background to the Gyn Onc team.