Claudette went to elementary and secondary schools run by nuns, studied diverse subjects, including medicine and pedagogy, in Spain, the US, Mexico and Haiti and she obtained a license in law and economics at the university in Port-au-Prince.
[4] In 1968-70 Werleigh worked as a medical technician and chemist in the US, in 1971-73 as a physiologist in Switzerland and in 1973-74 as an adult educator in Haiti.
Werleigh engaged in social and educational work in a number of non governmental organizations in the fields of adult literacy and humanitarian relief.
From March to August 1990 she was Minister of Social Affairs as an independent in President Ertha Pascal-Trouillot's interim government.
[7] Claudette Werleigh appointed a cabinet with 17 ministers, including 4 women, and declared that her aim was political, social, cultural and economic justice [8] She received financial support for energy, agriculture and road construction and improved relations with Cuba and Taiwan.
But the majority in parliament, which needed to approve the prime minister, had changed, so Werleigh withdrew and left the country.
In 2007 she was elected Secretary General of Pax Christi International, a non governmental catholic peace movement working on a global scale on a wide variety of issues in the fields of human rights, security and disbarment, economic justice and ecology.