For one thing, most of his professional life was spent in San Francisco, far from the New York City media center (though he was there 1939-1945). Moreover, part of that career was as an art director for major advertising agencies. Less unusually, he seems to have been largely self-taught.
There isn't much information regarding him on the Internet, but two sources worth visiting are here and here.
Setting all that aside, Ludekens was skilled at his trade. He did some cover and other work for the Saturday Evening Post, America's leading general-interest magazine at the time. And one of his advertising art clients was General Motors' Chevrolet Division, whose cars were the best-sellers. So from a commercial standpoint, Ludekens was in the front rank.
He also illustrated for True, the leading men's adventure magazine in the 1940s and 1950s.
Below are examples of Ludekens' work.