Historical photo of Jackson Roykirk.
Jackson Roykirk was a 21st Century Earth scientist who was largely credited for the creation of the Nomad space probe -- an artificially intelligent machine sent out with the mission to seek out new life. Roykirk's dream was to build a perfect thinking machine capable of independent logic. Spock described him as one of the most brilliant but erratic scientists of his time. (TOS: "The Changeling")
Although Roykirk is a 21st Century scientist on the photo he wears a standard 2260s Starfleet dress uniform.