Theres the name William Alexander.
I wasnt a big Bob Ross fan but Ive seen him quite a few times. William Alexander always used un mighty brush and a palette knife. Bob Ross had a collection of every brush made, but old William used about a 4 flat brush and palette knife and that was pretty much it.
Id heard that he (Alexander) was one of very few people that were actually successful artists in that he could sell enough paintings to live on. Though today he probably makes more from books/supplies/tapes or something that assumes hes still alive
he was getting up there the last time I saw him.
Bob could have painted with just one brush and a knife, but he was a shrewd businessman.