The signings join the Gorgeous roster from Park Pictures, Acord's New York-based production company. Park Pictures continues to represent all three in the US and the rest of the world.
The trio are the first international directors to join the Gorgeous roster, which includes Frank Budgen, Vince Squibb and Tom Carty.
Through Park Pictures, Acord has directed high-profile ads for brands including Adidas, Nike and Microsoft. He is best known, though, for his cinematography - he was the director of photography on films including Lost in Translation, Being John Malkovich and Buffalo '66.
Back is a comedy director whose spots include "golf" for Viagra. He was the seventh-most awarded director in this year's Gunn Report.
Baca-Asay is also a cinematographer. His film credits include the cult US comedy Super Troopers. His commercials reel includes ads for Nike, ESPN and Volkswagen.