W. G. Trautvetter was a pharmacist in the Chicago, Illinois, area and this ad indicates he had two stores in 1925, including one at 2338 E 71st Street. If I had not already know he was a pharmacist, this would have been a pretty big clue--and one that a person might not expect in a high school year book.
Trautvetter was born in Hancock County, Illinois, the son of George and Anna (Schildmann) Trautvetter. One just never knows what one will find in yearbooks--even in the advertisement section.
Search the Yearbook Collection at Ancestry.com for yourself and see what you discover.