Stephanie Leffler

CEO & Co-Founder

Stephanie Leffler brings years of experience building successful enterprises and overcoming challenges to her role as OneSpace’s CEO.

Stephanie took on her first CEO role in 2002 as founder of MonsterCommerce, a leading e-commerce storefront solutions company. Stephanie grew MonsterCommerce, powered by 280 team members, to more than 8,000 e-commerce clients before selling the company to Network Solutions in 2006. After 18 months at Network Solutions, Stephanie left to found OneSpace. In her spare time, Stephanie can be found at the nearest golf course, playing tennis, or spending time with her daughter and two labradoodles.

  • Awards & Accolades
  • St. Louis Business Journal 2011 Most Influential Business Women Honoree
  • St. Louis Business Journal Fastest Growing Company
  • St. Louis Business Journal Best Place to Work 2011 and 2012
  • St. Louis RCGA 50 Most Influential Companies in St. Louis
  • Finalist for Best Young Entrepreneur at the Stevie Awards
  • Finalist for Codie Award – Best E-commerce Software
  • Finalist for Ernst & Young Entrepreneur of the Year 2013

Leadership Team

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