- 1982 – Family Planning, University of California, San Francisco.
- 1991 – Obstetrics and Gynecology, Hospital of the University of Pennsylvania.
- 1987 – Surgeon, University of California, San Diego
- Professor in the UCSF Department of Obstetrics, Gynecology and Reproductive Sciences.
- Associate Professor at the College of Bixby.
- Visiting Associate Professor in Reproductive Health at the National Institute of Public Health of Mexico, where she worked from 1998 to 2009.
- Researcher affiliated with CISIDAT.
- Maternal mortality and morbidity, abortion, family planning, and adolescent reproductive health focused on Mexico.
- Participated in the reproductive health evaluation of the “Oportunidades” program, focused on family planning, the quality of prenatal and obstetric care, obstacles to institutionalized obstetric care, and critical links in the process of seeking and achieving care obstetric.
- She conducted a study comparing the quality of care provided by professional midwives, nurse midwives, and general practitioners in Mexico who contributed to the change in federal policy to reopen formal staff positions for professional midwives.
- Walker and her team developed a novel approach to PRONTO and emergency studies – using highly realistic simulation and team training to improve obstetric and neonatal outcomes.