You may not know the name, but you probably remember some of his movies. http://www.imdb.com/name/nm0920862/ (http://www.imdb.com/name/nm0920862/)
Wendkos mostly directed TV episodes and TV movies and a few theatricals, like the Gidget series and various B+ action movies. Here's what I remember him best for.
Fear No Evil (TV 1969)
The Brotherhood of the Bell (TV 1970)
The Mephisto Waltz (1971)
Haunts of the Very Rich (TV 1972)
The Legend of Lizzie Borden (TV 1975)
As you say, the name--no, but the movies, absolutely. MEPHISTO WALTZ and the LIZZIE BORDEN were cutting edge on 1970s tv. Wendkos entertained and surprised, something every director hopes to do.s