 As the FSF's first full-time paid employee, Tower mostly performed administrative tasks including managing mailing lists, newsgroups and requests for information.In 1986, Tower assisted Richard Stallman with Stallman's initial plan to base the C compiler for the GNU Project on the Pastel compiler Stallman had obtained from Lawrence Livermore Lab.Tower worked on rewriting the existing code from Pastel, a variation of Pascal, into C while Stallman worked on building the new C front end.