Working out of her basement, and with no teaching experience, Ms. Colvin created a nonprofit that helped people around the world learn to read. Literacy Volunteers, was chartered by New York State as a nonprofit with 77 tutors, 100 students. After a 2002 merger with Laubach Literacy International, the organization became ProLiteracy, with hundreds of programs and 100,000 tutors in 42 states and 60 other countries, offering lessons in scores of languages at homes, workplaces, prisons and other sites. For 60 years, Ms. Colvin remained a teacher and administrator, traveling widely and writing 12 books on her work.