Our Leadership

Matthew Cook, MBA

President, Benioff Children's Hospitals
Senior Vice President, Children's Services, UCSF Health

Matthew Cook is president of UCSF Benioff Children's Hospitals and senior vice president of Children's Services at UCSF Health. He oversees strategic direction, operations and clinical services for all pediatric care in Oakland and San Francisco; partners with academic programs within UCSF; and serves as a core member of the UCSF Health leadership team.

Cook came to UCSF from Indianapolis, where he served as president of Riley Children's Health. He also served as chief strategy officer for Indiana University Health, where he provided strategic direction and leadership for pediatric services throughout the state's largest health system. Under his leadership, physician engagement increased by 20 percent and the hospital's foundation successfully met its five-year capital campaign. His term as president also saw dramatic improvements in the hospital's U.S. News & World Report rankings, as it achieved its best performance to date.

Before his time in Indianapolis, Cook was executive vice president of strategic planning and business development at Children's Hospital of Philadelphia, and spent nine years as a principal at the Chartis Group, a health care consulting firm based in Chicago.

Cook graduated cum laude from the Wharton School with bachelor's degrees in economics and German. He earned a master of business administration degree from New York University, where he was class valedictorian.

Stacy Alexander, MHA

Vice President, UCSF Benioff Children's Hospitals
Chief Strategy Officer, Women and Children's Health, UCSF Health

Stacy Alexander is vice president of UCSF Benioff Children's Hospitals and chief strategy officer for women and children's health at UCSF Health. In these roles, she is responsible for developing a unifying business strategy across the children's hospitals, Betty Irene Moore Women's Hospital, UCSF Health's regional affiliate network, and UCSF Health's child and adolescent mental health services. She joined the senior leadership team in 2017.

Alexander has a diverse background spanning the spectrum of health care delivery, with experience in health system strategy, group practice operations, service line business development, physician network development and health care consulting.

Alexander earned her bachelor's degree in economics and her master of health administration degree at Duke University. She joined UCSF Health in 1997 and became part of the team at UCSF Benioff Children's Hospitals in 2012.

Ted Chaconas, MD, FAAP

Chief Medical Officer, UCSF Benioff Children's Hospital Oakland

Dr. Theodore Chaconas has served as chief medical officer of UCSF Benioff Children's Hospital Oakland since July 2019. He brings to the role a broad set of experiences from previous clinical, educational and administrative positions he has held at the institution.

Chaconas earned his undergraduate degree at the University of California, Davis and his medical degree from the University of California, San Diego. He completed a residency and chief residency in pediatrics at UCSF Benioff Children's Hospital Oakland. He worked in private practice and served as director of the foster care clinic for the Alameda County Child Health and Disability Prevention Program before returning to UCSF Benioff Oakland to join a new program for pediatric hospitalists.

In 1995, Chaconas was named director of UCSF Benioff Oakland's pediatric hospitalist program, a role he continues to hold today. From 1995 to 2007, he served as director of graduate medical education and the pediatric residency program, overseeing its expansion into one of the largest pediatric training programs on the West Coast. In 2006, he was a founding board member of Pediatric Multispecialty Medical Group, an association of subspecialists who provide care at UCSF Benioff Oakland clinics, and has served as its president for more than a decade. Additional roles he has held at UCSF Benioff Oakland include chair of the Department of Medicine and member of the board of directors of UCSF Benioff Children's Physicians, a foundation that connects specialists and group practices throughout Northern California, with a mission to advance pediatric and maternal care through collaboration.

Chaconas is a fellow of the American Academy of Pediatrics.

Jeffrey Chiu

Vice President, Human Resources, UCSF Health

Jeffrey Chiu is vice president of human resources for UCSF Health, including UCSF Benioff Children's Hospital San Francisco. In this position, he is responsible for driving strategic and operational initiatives to attract, develop and retain the top talent who ensure fulfillment of UCSF Health's mission, vision and goals. He oversees talent acquisition, compensation, onboarding and HR operations, employee and labor relations, benefits and leave of absence administration, HR information systems, occupational health services, workers' compensation, ergonomics and disability management, outreach and diversity, workforce planning, and contingent and temporary labor.

A New Jersey native, Chiu earned his undergraduate degree and master's degree in human resources management at Rutgers, the State University of New Jersey. After moving to San Francisco, he took a temporary position as a recruiting assistant in human resources with UCSF Stanford Health Care. Within a few months, he was hired as a permanent employee and has been with the organization through its transition from UCSF Stanford Health Care to UCSF Medical Center to UCSF Health. In his 22 years with UCSF human resources, he has held many roles, with responsibilities increasing as he moved from individual contributor to supervisor to manager and into his current role as executive leader.

Erin Hickey

Assistant Vice Chancellor of Development for Children’s Health

Erin Hickey has served as assistant vice chancellor of development for children's health since 2016. She designs and directs fundraising strategies for UCSF Benioff Children's Hospitals, working in both Oakland and San Francisco, and for the entire children's health enterprise.

Hickey joined UCSF in 2007 as lead consultant for the fundraising campaign of UCSF Medical Center at Mission Bay, which includes UCSF Benioff Children's Hospital San Francisco. In 2014, following the affiliation of UCSF and Children's Hospital Oakland, she was named interim executive director of development for UCSF Health.

Hickey has a bachelor's degree in journalism from the University of Oregon.

Raphael Hirsch, MD

Physician-in-Chief, UCSF Benioff Children's Hospitals

Dr. Raphael Hirsch is physician-in-chief at UCSF Benioff Children's Hospitals, a role he has held since 2019. He also chairs the UCSF Department of Pediatrics. He has articulated a vision for the UCSF pediatric program to be among the best in the nation, with the overarching goal of making the world better for all children. He works to grow research and expand the institution's clinical outreach to better serve the region's communities. Among his guiding principles is the belief that academic medical centers must demonstrate a commitment to social justice.

After earning his bachelor's degree at Northwestern University, Hirsch earned his medical degree from the University of Illinois at Chicago. He completed a residency in pediatrics at the University of Minnesota at Minneapolis, followed by a fellowship in pediatric rheumatology at the National Institutes of Health (NIH) and Children's National Hospital.

From 2012 to 2019, Hirsch served as executive officer and chair of the pediatrics department at the University of Iowa and as physician-in-chief at University of Iowa Stead Family Children's Hospital. He was responsible for pediatric services, including patient care, education, research and public health, both at the collegiate level and for the health system. During this time, he helped direct a transformation of the pediatric medicine program, spurred by construction of the first freestanding children's hospital for the University of Iowa. Before that, he served for 10 years as chief of the pediatric rheumatology division and vice chair for faculty development at UPMC Children's Hospital of Pittsburgh and the University of Pittsburgh School of Medicine. Under his leadership, the division grew from a single clinician into one of the largest and most comprehensive programs in the country.

Hirsch has held numerous leadership positions in the American College of Rheumatology, most recently as a member of its board of directors. He served on the board of scientific counselors for the National Institute of Arthritis and Musculoskeletal and Skin Diseases, a branch of the NIH. His research has sought a better understanding of childhood rheumatic diseases, with the goal of developing improved therapies, and was funded by the NIH for more than 25 years. He has published nearly 100 scientific papers.

Jamie C. Phillips, MHA, FACHE

Chief Operating Officer, UCSF Benioff Children's Hospitals

Jamie C. Phillips is chief operating officer at UCSF Benioff Children's Hospitals. She has extensive experience in diverse administrative roles with other leading-edge health care delivery systems and organizations, including Nationwide Children's Hospital, Trinity Health System, Cincinnati Children's Medical Center and OhioHealth.

Phillips earned a bachelor's degree in health care administration, with a minor in business administration, from Ohio University, followed by a master of health administration degree from the Ohio State University. She is an active fellow of the American College of Healthcare Executives.

Phillips has completed leadership development programs that include one with the Urban League of Greater Cincinnati and United Way of Central Ohio's program called Project Diversity Pride Leadership. She received the YMCA of Greater Cincinnati's Achiever Award and the Ohio Diversity and Leadership Conference's Multicultural Leadership Award. She has served as a mentor for Big Brothers Big Sisters of America's school-based program.

Phillips is an adjunct professor in health administration at Franklin University. She is a member of Alpha Kappa Alpha Sorority.

Vanessa Roshell-Stacks, MHA

Vice President, Ancillary and Support Services, UCSF Benioff Children's Hospital Oakland

Vanessa Roshell-Stacks is vice president of ancillary and support services for UCSF Benioff Children's Hospitals. In this critical role, she is responsible for the operational, financial and strategic activities of a broad range of departments and programs across the organization. In addition, she serves as site administrator for the Oakland campus.

Roshell-Stacks began her health care career providing therapy for autistic children. She now has more than 20 years of health care experience, with a strong foundation in operational efficiency, care management and population health, patient flow, decision support, and revenue cycle management. Throughout her career, she has served in leadership positions in a variety of premier health care organizations. Before joining UCSF, she was vice president of operations for Rush University Medical Center, where she led a number of diverse departments.

Roshell-Stacks thrives as a leader who serves, bringing a desire to deliver high-quality, cost-effective solutions in a compassionate, collaborative and patient-centric manner. She is trained in the process improvement methodology Lean Six Sigma. She earned a bachelor's degree in experimental psychology and a master's degree in health administration at the University of South Carolina.

Susan Toland

Director of Communications, UCSF Benioff Children's Hospitals

Susan Toland is director of communications for UCSF Benioff Children's Hospitals. Her responsibilities span the UCSF Health pediatric and adult care systems, and include leading internal communications strategy for UCSF Benioff Children's Hospitals, supporting leadership and external communication directives, and participating in the hospital incident command system response. In the highly collaborative role of communications director, she works closely with many UCSF units responsible for disseminating and receiving information, including patient communications, public relations and marketing.

Toland came to UCSF Benioff Children's Hospitals in 2019, bringing expertise in internal and external communications, strategic initiatives and customer experience programs. Her experience includes founding her own boutique consulting practice specializing in messaging, crisis communications, public and media relations, community outreach, and branding and identity campaigns.

Ted Wang

Chief Financial Officer, UCSF Benioff Children's Hospitals | UCSF Health, Children's Services

Ted Wang is chief financial officer for UCSF Benioff Children's Hospitals and for Children's Services at UCSF Health. He oversees the full scope of financial management for the children's hospitals, splitting his time between the Oakland and San Francisco campuses. His responsibilities include financial and capital planning, budgeting, financial reporting reimbursement, revenue cycle management, and design and operation of internal control systems. He also leads key interdepartmental initiatives for UCSF Health.

Wang brings more than 20 years of financial experience in health care systems to UCSF. He previously served as chief financial officer at Providence Little Company of Mary Medical Centers, San Pedro and Tarzana. Before that, he was chief financial officer at Providence Cedars-Sinai Tarzana Medical Center, where he led the management team in winning the President's Award for Excellence, and served in auditor roles for Anthem Blue Cross and Tenet Healthcare.

Wang holds a bachelor's degree in economics from the University of California, Santa Barbara and is pursuing a master of health administration degree from Cornell University.

George Weiss, MHA

Vice President, Operations, UCSF Benioff Children's Hospitals

George Weiss is vice president of operations for UCSF Benioff Children's Hospitals. He has 20 years of experience in pediatric health care, including in the areas of clinical operations, process improvement, business development, fundraising and strategic planning. His career spans the sales and service industries, community organizing, public health research and health care administration.

Prior to joining UCSF, Weiss worked for 18 years at Children's Hospital Los Angeles (CHLA), where he managed multiple behavioral and interventional research projects; served as administrator for the divisions of neurology, psychiatry, and research on children, youths and families; and served as administrative director of the Cancer and Blood Diseases Institute. He was also the first executive director of the CHLA Health Network, a physician-led network of pediatricians and pediatric specialists in Los Angeles. He has co-authored 28 peer-reviewed published articles on research related to the pediatric medicine community and health services.

Weiss earned his bachelor's degree from Pomona College and his master of health administration degree from the University of Southern California.

Phyllis Weiss

Vice President, Human Resources, UCSF Benioff Children's Hospital Oakland

Phyllis Weiss has served as vice president of human resources at UCSF Benioff Children's Hospital Oakland since 2016. She is also a consultant to management on development of the senior leadership team, employee relations and recruitment.

Weiss has experience in labor relations, labor contract negotiations, and grievance and arbitration resolution. She served as manager of employee and labor relations at UCSF Benioff Children's Hospital Oakland from 1988 to 2001. She next held positions at San Leandro Hospital, Eden Medical Center and Alameda Hospital before returning to UCSF.

Stephen Wilson, MD, PhD

Chief Medical Officer, UCSF Benioff Children's Hospital San Francisco

Dr. Stephen Wilson is chief medical officer (CMO) of UCSF Benioff Children's Hospital San Francisco. He also serves as vice president of physician network development for the community provider network of UCSF Benioff Children's Hospitals. In these roles, he has broad oversight of inpatient and outpatient faculty practices at the Mission Bay and Mount Zion campuses in San Francisco, as well as of faculty and community partner practices across Northern California. He is a pediatric hospitalist and pain medicine specialist, and a professor of pediatrics.

First as associate CMO and then as CMO, Wilson established the inpatient and outpatient Access Centers, which facilitate the safe, rapid transport of pediatric patients referred to UCSF from other medical institutions in Northern California, and the streamlined acceptance of patients referred to our pediatric specialists. He also established the quality improvement and patient safety programs for UCSF Benioff Children's Hospital San Francisco, the Integrated Pediatric Pain & Palliative Care service, and a new pediatric emergency department at the Parnassus campus, in preparation for its move to the new children's hospital at Mission Bay.

In his current development role, Wilson led the establishment of a Northern California physician network encompassing six community hospitals and more than 200 pediatricians. This collaboration with the pediatric specialists of UCSF Benioff Children's Hospitals facilitates delivery of the highest-quality care throughout the region. He serves on the board of directors for UCSF Benioff Children's Physicians, a multispecialty Bay Area medical foundation.

Wilson earned his undergraduate degree at the University of California, Berkeley, and his medical degree and doctorate in immunology at Harvard Medical School. He completed a residency in pediatrics and a fellowship in medical education at UCSF.

Following his training, Wilson served on the UCSF community faculty at Kaiser Permanente San Francisco and Valley Children's Healthcare in Fresno, where he founded pediatric hospitalist programs and established pediatric training sites for UCSF. In 2001, he joined the UCSF faculty at the main campus, where he co-founded the pediatric hospitalist program and established the Division of Hospital Medicine within the UCSF Department of Pediatrics.

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