Sister María Isolina Ferré Aguayo, MSBT, was born on September 5, 1914 in Ponce, Puerto Rico. She was the youngest daughter of Antonio Ferré Bacallao and Mary Aguayo Casals. She made her dream of dedicating herself to missionary work come true when she joined the Missionary Servants of the Holy Trinity in Philadelphia, Pennsylvania in 1935. 

She earned a Bachelor of Arts from Saint Joseph College for Women in Brooklyn, New York, and a Masters in Sociology with a minor in Criminology from Fordham University, New York. 

Her missionary work led her to serve vulnerable populations in the United States and Puerto Rico, from mining regions to highly populated places with great social challenges. Her compassion built resilience and a legacy of service in underserved communities. A woman of faith and hope, she arrived in her hometown of Ponce in 1968 to retire from her. But, her relentless spirit and vocation for service led her to open the Orientation and Services Center in 1969, today the Sor Isolina Ferré Centers, to attend to the urgent problems of the community. Her earthly life ended on August 3, 2000. 

Since then, at the Sor Isolina Ferré Centers we have kept her legacy alive, building strong communities through service with love, respect, dignity and justice.