Mathias Dexter Oberlin, called Dex by his friends, was a Starfleet helmsman in the 24th century. During the 2380s, he served aboard the USS Westphalen as conn officer. A "boomer" of German heritage, Dex was born in 2355, aboard the FCV Whippoorwill en route from Altair VI to Vega. (Star Trek: Pendragon: "The Argonaut Syndrome", "The Kraken")