Jonathan Esteban

J.T. Esteban was a 23rd century Starfleet officer, captain of Federation starship USS Grissom in 2285.

Esteban's vessel was assigned the politically important mission of examining the controversial Genesis Planet, created in the diastrous implosion of Reliant in the Mutara Nebula. Assigned to his command were new science officer, Lt. Saavik and civilian Genesis Device co-developer Dr. David Marcus.

Esteban took careful moves throughout the mission, being sure to notify Starfleet of all developments before he authorized his crew to begin a full-scale study of the world. However, the danger was great, and Esteban and his entire crew, save sole survivor Saavik, perished under attack by Commander Kruge's Klingon Bird-of-Prey. (Star Trek III: The Search for Spock)