Crewman Joe Martinez was a Starfleet officer who served during the early 25th century. In 2401, Martinez served on the USS Titan-A's gamma shift. (PIC: "The Next Generation")
This character was only mentioned in writing. They were listed on an illegible duty roster in "The Next Generation" which was later shared by Bill Krause on Twitter. [1]
Joe Martinez was a member of the art department on Star Trek: Picard and the namesake of this character.