In 1978, the first History of Programming Languages Conference (HOPL) described the development of 13 computer programming languages, the people who participated in that work, and the context in which it was undertaken. In 1993, HOPL-II contained 14 papers on the genesis and evolution of programming languages. Fifteen years later, it was time for HOPL-III, which was held in conjunction with FCRC 2007 in San Diego. The 12 HOPL-III papers detailed the early history or evolution of specific programming languages. Preliminary ideas about each language was documented by 1996 and each language was in use by 1998.