Ed pitched in the Majors from 1944-55, and is best remembered for being a member of the Yankees starting rotation that won five consecutive World Series from 1949-53. He earned the nicknames "Steady Eddie" and "The Junkman" during his career, but now-a-days, the "Steady Eddie" moniker has been usurped by another former Oriole.
Eddie earned his keep by being a junkballer; he could never throw the ball particularly fast but kept the hitters guessing. I found this Casey Stengel quote about him particularly amusing: "Lopat looks like he is throwing wads of tissue paper." I guess that gives you a decent idea about how hard he must have been to hit against.