Sgt. Pepper's Lonely Hearts Club Band

[Royal Tenenbaum]

Richard Lush was the second engineer on Sgt. Pepper and that's it from what I can tell. Most of the techniques employed where started with Rubber Soul and Revolver and then just taken to a another level. I would credit him as being a major reason, although I will give him credit. It could have been done without him, either way.

edit: Also, he did do Plastic Ono Band, and that is one of the finest albums ever made, so I have to give him credit for that as well.