Epsy Campbell Barr was born in San José in 1963, while her parents Shirley Barr Aird and Luis Campbell Patterson were living in San Francisco de Dos Ríos. She is the fourth child of a family of five daughters and two sons. Other notable siblings include Sasha Campbell Barr, a well-known singer, and Shirley Campbell Barr, a world renowned poet. Epsy Campbell is named after her paternal grandmother, who migrated from Jamaica to Costa Rica as a child. Her Afro-Costa Rican grandparents migrated to the country at the turn of the 20th century to build the country's first railroads. She married at a young age and became a mother when she was just starting her university studies. She has two daughters, Narda and Tanisha. She attended primary school in Las Gravilias and Ricardo Jiménez Oreamuno School where she graduated in 1975, and completed her secondary education at Liceo Franco Costarricense and Colegio Superior de Señoritas. She studied flute and saxophone in the Youth Symphony Orchestra from 1976 to 1983. Epsy Campbell began her university studies at the University of Costa Rica and later moved to the regional campus of Limón Province, where she studied and worked simultaneously. She lived on the Caribbean for ten years, then returned to San José, where she graduated as an economist from the Latin University of Costa Rica in 1998. She has an MA in Development Cooperation from the Foundation for Cultural and Social Sciences of Spain in 2008. She is a researcher and activist for the rights of women and people of African descent, and entered politics because she wanted to become a social activist. She was president of the Citizens' Action Party from February 2005 to February 2009. She was also a deputy for the PAC in the national legislature from 2002 to 2006, and the head of its parliamentary faction from 2003 to 2005. She was a vice-presidential candidate in 2006.
After serving in the legislature for four years and running for vice president in 2006, Campbell decided to seek the nomination of the PAC. She traveled the country in an RV, taking her anti-corruption and accountability message to PAC voters. Three other candidates vied to represent PAC in the 2014 national elections: Juan Carlos Mendoza, Luis Guillermo Solís, and Ronald Solís Bolaños. As of February, 2013, she was the most popular opposition candidate; however, she bowed out of the race to Luis Guillermo Solís. Solís became Costa Rica's president elect in March 2014.
2014 deputy election
In March 2014, Campbell won a deputy position in San Jose, Costa Rica as a PAC candidate. When Solís became the de facto president elect, he mentioned that Campbell would be one of his choices for President of the Legislative Assembly, although Henry Mora Jiménez became the President of the Legislative Assembly in May 2014.
Campbell initially announced her intention to run in the PAC presidential primary for the 2018 presidential election, but withdrew from the race on 27 March 2017. However, she was subsequently selected by nominee Carlos Alvarado Quesada as one of two joint running mates, alongside Marvin Rodríguez. She condemned remarks by PIN candidate Juan Diego Castro alleging that female members of the Judiciary advanced in promotions due to sexual favors. Alvarado Quesada eventually advanced to the runoff and won, with Campbell becoming the first Afrodescendant vice-president of the country.