Al Wiseman was Hank Ketcham's assistant on Dennis the Menace, but where I encountered him was in the comic book versions of Dennis. Wiseman's artwork was excellent, and not only did he do a great job on Dennis and the other characters, but he could really draw architecture. He gave us a view of 1950s suburban America at Dennis' eye-level.
There were a series of special giant comics that came along in the late '50s-early '60s: Dennis the Menace In Mexico, in Hollywood, in Hawaii, etc. Where they were different for me was that Al Wiseman and writer Fred Toole had write-ups in the comics. They were given credit! Wiseman and Toole got their names and photos in the books. Ketcham must've really thought a lot of them to allow that.
There's an Al Wiseman website, but it doesn't look like it's had any activity in a couple of years.
This fun take on Treasure Island from Dennis' point of view is from Dennis the Menace #17, 1956. It was reprinted a couple of times. I think it's an excellent example of Toole and Wiseman's superior work on Dennis.