Fifty-plus. Career has encompassed: technical writing, tech pubs manager, programming, technical training, marketing manager, proposal and grants writer, novelist (three novels), historian (one published, two in the pipes), journalist, news editor, and photographer. I've worked in many types of software, astronomical equipment, pharmaceuticals, environmental engineering, and accounting.
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Q&A for professional and enthusiast programmers