Culbertson founded and edited "The Bridge World" magazine, which is still published today, and wrote many newspaper articles and books on bridge. He owned the first firm of playing card manufacturers to develop plastic cards, Kem Cards, and developed and owned a chain of bridge schools with teachers qualified in the Culbertson bidding system. He continued to play high-stakes rubber bridge for many years, but gave up tournament and match competition in 1938 to write and work for world peace.