After leaving elected politics, Castor was the director of the Patel Center for Global Solutions at the University of South Florida and later became chair of the J. William Fulbright Scholarship Board.

[2] She also works with Ruth's List Florida,[3] a group dedicated to recruiting and aiding qualified Democratic women candidates, receiving the Architect of Change Award [4] from them in May 2018.

While in East Africa, Castor participated in a project to help lead two dozen African school girls to the summit of Mount Kilimanjaro in Tanzania, the first all-female expedition to accomplish this.

[7] She returned to the U.S. in 1965, and settled in Miami-Dade County, Florida, where she was a teacher while studying for her Master of Education degree at the University of Miami, which she received in 1968.

Castor's second daughter, Karen, was born in 1968 and her son, Frank, who currently serves as judge in Palm Beach County, Florida, in 1970.

She was the co-sponsor of the Equal Rights Amendment (1977) and championed bills to end discrimination and fund spouse abuse centers statewide.

USF joined its sister institution, the University of Central Florida, in creating an academic and economic partnership, the I-4 High Technology Corridor.

[8] The mission of the board is to build a system of high standards for education and encourage teachers throughout America to pursue its rigorous certification process.

[11] The overwhelming support for Martinez among Latinos effectively counterbalanced Castor's relatively high popularity among swing voters throughout the state.

[citation needed] In January 2007, Castor was appointed executive director of the Patel Center for Global Solutions at the University of South Florida.