sentences:  In 2009 he was awarded the SIGCSE Outstanding Contribution Award "for an extraordinary record of teaching, curriculum development, publishing papers as well as numerous textbooks, and for helping to shape Computer Science education".Koffman chaired the Association for Computing Machinery (ACM) task force to revise CS1 and CS2 courses from 1983 to 1985.He was also chairman of the ACM Special Interest Group in Computer Science Education (SIGCSE) from 1987 to 1991.