A well-known entrepreneur in Washington County has died. Ninety-two-year-old Jack Piatt of Chartiers Township, died Friday. Piatt may be best-known for the launch of Millcraft in 1957, as a small machine shop that grew into a diverse company with ties to several industries, and as the visionary behind Southpointe, a mixed use development project that now covers some eight-hundred acres in Cecil Township. Funeral arrangements are private but the family says it hopes to hold a “Celebration of Life” sometime next year.