Kathleen O'Brien worked at Shepardson Microsystems, where she wrote the Atari Assembler Editor cartridge, and wrote the floating point routines in Atari BASIC. (Her husband Paul Laughton wrote the rest of Atari BASIC.) She, along with Bill Wilkinson and Paul Laughton, co-founded Optimized Systems Software, where she wrote much of the book “Atari BASIC Source Book”.
LINKS
Atari BASIC Source Book
Bill Wilkinson interview
Paul Laughton interview
ANTIC The Atari 8-bit Podcast