In 1976 he became head writer of the bilingual sitcom ¿Qué Pasa, USA?, produced by Miami's public television station WPBT.
Running for five years, the show received six regional Emmys and nine special awards from the Association of Critics and Commentators on the Arts for its producers, directors, writers, and cast.
Santeiro also contributed scripts and song lyrics to other children's programs, such as 3-2-1 Contact, Big Bag, Oye, Willie, and Little Bill.
For his writing for children's television programs, Santeiro has been nominated for 20 Daytime Emmy Awards and has won 14, 12 of these during his 29-year career with Sesame Street.
[1] He picked up the Leone in Memoriam award given to Tomas Milian at the 7º Almería Western Film Festival on October 11, 2017.