The founders of Delta Sigma Pi were Alexander F. Makay, Alfred Moysello, H. Albert Tienken, and Harold V. Jacobs. They decided they should do something for the benefit of the student body at large. They decided to form a club that would be open to all business students. Hence, Delta Sigma Pi. I could not find the first two deceased original brothers, but Jacobs was the last one living among the four.
History of Delta Sigma Pi
Moysello died in 1941, Tienken died in 1949, Jacobs died in 1972 and I cannot find the dod for Makay, but he would have died before Jacobs.