Mary Ann Horton

Mary Ann Horton (born Mark R. Horton, November 21, 1955), is a Usenet and Internet pioneer. Horton contributed to Berkeley UNIX (BSD), including the vi editor and terminfo database, created the first email binary attachment tool uuencode, and led the growth of Usenet in the 1980s.

Horton successfully requested the first transgender-inclusive language added to the Equal Employment Policy in a large American company, and championed the language and insurance coverage of transgender health benefits at other companies.

Horton is a computer scientist and a transgender educator and activist.