[3] In the 1950s, Estrada penciled and inked "Bunker", the first comic-book story to feature an African-American hero,[4] and "Rough Riders".

[5] In the late fifties he drew almost half the satirical articles of the first two issues of the Mad magazine imitator Frantic.

He did political cartoons for the Spandauer Volksblatt in the morning and did storyboards for the advertising company Deutschen Documentar in the afternoons.

In 1976, Estrada's work was in such high demand from DC that he illustrated the premiere issues of six separate titles that year: All Star Comics, Blitzkrieg, Freedom Fighters, Isis, Karate Kid,[13] and Super Friends.

That story came to the attention of Hugh W. Pinnock, who was in charge of creating a comic-style adaptation of the New Testament for the Church of Jesus Christ of Latter-day Saints, and in 1980 Estrada drew all the pictures for that book.

[1] In the 1980s, he collaborated on the animated television series He-Man and the Masters of the Universe, Galtar, The New Adventures of Jonny Quest, and Bionic Six.