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10 Work Lessons You Can Learn from Mad Men

10 Do's & Don'ts Gleaned from the 1960s Office Environment

4. Don't Let the Boss Find Out About Side Projects

Congenial accounts man Ken Cosgrove revealed his secret alter ego this season; in his off-hours he was up-and-coming sci-fi author Ben Hargrove. However, when word of these endeavors makes it to Roger Sterling, the boss chastises Ken and threatens to fire him if he doesn't give up his literary ambitions.

Ambition is fine, but letting your second career interfere with your current job can only cause trouble.