[3][4] Johnson earned her Juris doctor from Harvard Law and her Bachelor of Arts in interdisciplinary studies from the University of Southern California.

Prior to joining the firm, Johnson was an attorney with Simpson, Thacher & Bartlett and worked as a law clerk on the United States Court of Appeals.

On June 16, 2022, the University of Southern California announced Johnson was elected Chair of the Board of Trustees, replacing Rick Caruso [13] and making her the first woman to hold the position.

Johnson is also a member of the Global Agenda Council for the Future of Financial and Monetary Systems for the World Economic Forum.

On June 16, 2022, USC announced Johnson has been elected Chair of the Board of Trustees, replacing Rick Caruso.