Breen Sullivan

Breen Sullivan is a C-Suite executive with experience in operations, commercial contracting, human resources and employment matters; organization, corporate and deal strategy; Board of Director communications and responsibilities; privacy and risk management; financial matters, and occasionally novel challenges. As a career GC, Breen has worked with startup and high growth companies for over a decade, specializing in technology, SaaS, energy efficiency, and data science. 

She is also the Founder of The Fourth Floor, a Market Network on a mission to close the gender power, wealth, and funding gap by diversifying boardrooms and cap tables. The Fourth Floor matches startups and companies to board-ready women in a trusted, efficient, and cost-effective way to disrupt the traditional board search process and overcome systemic barriers that have kept women out of the board candidate pipeline. The Fourth Floor also matches under-represented founders and fund managers with women angels and LPs in order to overcome the systemic barriers that have kept women from writing checks and accessing funding. 

Key Experience

  • Chief Administrative Officer, General Counsel & Chief Human Resource Officer, Watermark Insights, LLC
  • Head of Legal and Business Affairs, Known Global LLC
  • General Counsel, Bright Power, Inc.
  • Intellectual Property Associate, Kilpatrick, Townsend & Stockton, LLP
  • Tulane University School of Law, J.D.
  • Yale University, B.A.

Bar Admission

New York

Professional Memberships & Affiliations


The Fourth Floor


Honors & Awards

Breen and The Fourth Floor have been featured by Forbes, Corporate Counsel Magazine,, The American Lawyer, Above The Law, Women On The Record Podcast, and Her CEO Journey: The Business Finance Podcast for Women Entrepreneurs.

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