T. Grodnick was a 23rd century Starfleet lieutenant commander assigned to the Starfleet Academy's Starfleet Training Command. Grodnick served as instructor for Astrogation.
In 2285, Grodnick was listed on a directory placard found on the second level of Starfleet Training Command. This lieutenant commander had an office in room 206. (Star Trek II: The Wrath of Khan)
T. Grodnick was named after assistant director Todd Grodnick. The placard mentioning this lieutenant commander was sold on It's A Wrap! sale and auction for US$31.99. [1]