The story
SSI was founded by Robert Clark in 1970. SSI headquarters was in Fort Collins, Colorado, and it is owned by Concept Systems International, Inc. In 2008, it was acquired by Doug McNeese, owner of the National Association of Scuba Diving Schools (USA) until its merger with SSI in 1999, and Robert Stoss, manager of Scubapro and Seemann Sub. On January 1, 2014, SSI was acquired by HEAD, which also includes the Mares brand of diving equipment, HEAD NV, for €4.9m. The current SSI headquarters is located in Wendelstein, Bavaria.
From Wikipedia’s article on Scuba Schools International, shared under CC BY-SA 4.0.4