What firm does Joan Harris found in Mad Men's final season?

Joan Harris founds the firm Holloway-Harris in Mad Men’s final season.

After years of rising through Sterling Cooper and its successor agencies, Joan decides to build a business of her own. In season seven, she develops a production company from her apartment, using the name Holloway-Harris and taking on work connected to commercial and corporate production.

The firm represents a major change in Joan’s professional life. She began the series as Sterling Cooper’s office manager and later became a partner and director of agency operations. Her expertise, organization, and understanding of clients increasingly make her an executive in her own right rather than merely the person who keeps an advertising office running.

Viewers sometimes confuse Holloway-Harris with Harris Olson, the company Joan proposes creating with Peggy Olson. That proposed partnership is a separate possibility. By the finale, Joan is operating Holloway-Harris independently, while Peggy remains at McCann Erickson.