T. Grodnick

From Memory Alpha, the free Star Trek reference

T. Grodnick was a 23rd century Starfleet lieutenant commander attached 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. (Star Trek II: The Wrath of Khan)