Executive Staff


Dr. Lisa M. Hollier took the role of interim executive vice president (EVP) and CEO on November 1, 2018. As interim EVP and CEO, she oversees the day-to-day operations of ACOG and, with her executive team, provides leadership to more than 200 staff members. She was elected to the office of president in April 2018 and continues to hold that position. 

Dr. Hollier's undergraduate work was completed at Pomona College, and she attended medical school at Tulane University, where she also received a master’s in public health. Following residency training at the Baylor University Medical Center in Dallas, Texas, she completed a fellowship in maternal-fetal Medicine at University of Texas (UT) Southwestern, also in Dallas. Dr. Hollier has been on the academic faculty at UT Southwestern, UT Houston, and Baylor College of Medicine, rising to the rank of professor. In Texas, her roles include chief medical officer for obstetrics and gynecology with Texas Children’s Health Plan and chair of the Texas DSHS Maternal Mortality and Morbidity Task Force.

During her long history of involvement with ACOG, Dr. Hollier has held ACOG District office in Districts VII and XI. She is also past chair of ACOG District XI. Dr. Hollier has served ACOG in a number of other capacities on committees and task forces and was the assistant secretary and president-elect prior to becoming president. Her strategic initiatives as ACOG president focus on reducing preventable maternal mortality. She is a national resource and leader on this subject, which is one of the most serious health issues facing women across the globe. Throughout her career, Dr. Hollier has been dedicated to caring for the underserved and improving women’s health by advancing women’s health policy. 


Erin Hultman, CPA, MST, is ACOG’s chief financial officer, responsible for financial planning, reporting, and risk management. She also oversees ACOG’s investment and endowment portfolios. 

Prior to joining ACOG, Hultman served as the chief financial officer for subsidiaries with the American Society of Clinical Oncology. She also spent over 15 years in public accounting providing audit, tax, and consulting services to a wide range of tax-exempt organizations. She has over 20 years of experience supporting not-for-profit programs and ensuring organizations’ resource allocation aligns with its mission and goals.

Hultman holds a bachelor’s degree in business administration from James Madison University and a master’s degree in taxation from George Mason University. She is a certified public accountant licensed in the state of Virginia.  

Marc Jackson, MD, MBA, is the vice president of education. In this role, Dr. Jackson oversees the Annual Clinical and Scientific Meeting, the Council on Resident Education in Obstetrics and Gynecology, District and Section Activities, CME, and freestanding postgraduate continuing medical education courses.

Dr. Jackson comes to ACOG from the University of Utah School of Medicine, where he was a professor in the department of obstetrics and gynecology and a maternal–fetal medicine physician. He also practiced maternal–fetal medicine and served as the medical director of interprofessional continuing education at Intermountain Healthcare in Salt Lake City.

A graduate of the University of Texas Southwestern Medical School, Dr. Jackson completed his residency at the University of Texas in San Antonio and his maternal–fetal medicine fellowship at the University of Pennsylvania.

Dr. Jackson served as chair of ACOG’s Committee on Practice Bulletins for obstetrics and was on the editorial board of the Green Journal, the ACOG Committee on Obstetric Practice, and the ACOG Evidence-Based Medicine Work Group.

Sara Needleman Kline, JD, is the chief legal officer. In this role, Kline advises ACOG on all legal matters affecting the organization and represents ACOG in legal proceedings. Kline joined ACOG’s legal team in 2000 and has served in her current position since 2017. Before joining ACOG, she was a litigation associate at a major District of Columbia law firm and clerked for the Honorable Leonie M. Brinkema of the United States District Court for the Eastern District of Virginia. Kline received her juris doctor from the American University Washington College of Law and received her undergraduate degree from the University of Pennsylvania.

CHRISTOPHER M. ZAHN, MDChristopher M. Zahn
Dr. Christopher M. Zahn is the Vice President, Practice Activities. A retired Air Force Officer and member of ACOG’s Armed Forces District, he received his medical degree from Uniformed Services University of the Health Sciences and is a specialist in comprehensive obstetrics and gynecology who has been practicing for 29 years. Before joining ACOG, Dr. Zahn was Professor and Chair of Obstetrics and Gynecology at the Uniformed Services University of the Health Sciences (USUHS), and a staff physician in the Departments of Obstetrics and Gynecology and Pathology at Walter Reed National Military Medical Center in Bethesda, Maryland. He was also the Program Director of the Uniformed Services Residency in Obstetrics and Gynecology, a maximally accredited tri-military Service residency in Obstetrics and Gynecology, under the auspices of the National Capital Consortium at USUHS. Dr. Zahn has also been a member of the ACGME Review Committee for Obstetrics and Gynecology, and is currently a member of the Board of Directors of the American Board of Obstetrics and Gynecology.

American College of Obstetricians and Gynecologists
409 12th Street SW, Washington, DC  20024-2188
Mailing Address: PO Box 96920, Washington, DC 20024-9998