Samuel Boma was a human scientist in the 23rd century. In the 2260s, Boma was a lieutenant in Starfleet and served in the sciences division aboard the USS Enterprise as an astrophysicist.
In 2266, Boma accompanied a fifteen-man survey team to Tlaoli IV. (TOS - The Janus Gate novel: Present Tense)
In 2267, Boma was assigned to accompany Commander Spock and a scientific party to study the Murasaki 312 quasar aboard the shuttlecraft Galileo. During the survey the Galileo crashlanded on the planet Taurus II, and the party were forced to fight for survival and return to the Enterprise. During the course of the mission Boma openly defied Spock's command.