Jack Swinbank - Peteric Engineering
Jack Swinbank was a sheet metal worker employeed by Peteric Engineering. R2-D2 was almost 100% sheet metal fabrication and most likely 99% constructed by Jack.
"Now Jack was critical to this operation, because Jack was one of the finest sheet metal workers I have ever come across, and he would be able to tell you exactly in the flat, where to make a hole, so that when you bent it, it came in at exactly the right place."
"Poor Jack had to do all the horrible calculations, and lay out all these things in the flat, and hope to God that when we bent them, we got the holes in the right places."
"The most important person was Jack Swinbank (he is the one in your picture) as he worked out all of the dimensions and probably made the markings on the head mould."