I keep slowly working through my box of negatives. Despite my research, I cannot tell what type of plane is in this photo. For me the photo contains little information, I am sure other people with aircraft knowledge can immediately identify the plane. The signs in the background are basic: "scrap container", "keep this area clear", etc. So, I could not gather any further clues.
If I were to guess, I would say the gentleman in the photo is an investor, banker, or even the owner of the plane.