Marianne is a multi-disciplinary practice leader in Transwestern’s Milwaukee office. As a trusted strategic partner, she brings an advisory approach and a “best-in-class” platform to create successful outcomes for tenants, building owners, investors and developers in today’s challenge-filled yet opportunity-rich real estate marketplace.


Marianne’s practice specialties include office tenant representation, buyer representation for owner-occupied and investment properties, landlord representation for office leasing, site search and analysis for development/redevelopment projects, and consulting services in advance of transaction-related work.
Representative clients include both national and local firms such as Ascension, Bader Rutter, Lubar & Co., Nicholas Company, AIG, Alliant Energy, Monster Worldwide, Park National Bank, Optique Capital Management (John Hancock), American Deposit Management, URS, Halling & Cayo S.C., iSi North America, Pieper Properties, Principal Capital, Gorman & Company, Cardinal Stritch University and others.
Prior to joining Transwestern, Marianne was a Partner at Siegel-Gallagher Inc. (SGI), a highly regarded locally owned Milwaukee commercial real estate firm. She was previously a Senior Valuation Consultant with American Appraisal Associates, specializing in business enterprise, capital stock and intangible asset valuations for Fortune 500 clients nationally.


  • Commercial Association of Realtors Wisconsin (CARW), Board of Directors
  • Commercial Association of Realtors Wisconsin (CARW), Judges’ Choice Deal of the Year – Cardinal Stritch University Campus Sale (2023)
  • Commercial Association of Realtors Wisconsin (CARW), Deal of the Year Award – Office – Bader Rutter (2016)
  • National Association of Realtors (NAR), Member
  • Wisconsin Realtors Association (WRA), Member


Marianne earned a bachelor’s degree and a master’s degree in business administration from Marquette University. She is a licensed real estate broker in Wisconsin. Marianne is also a Certified Commercial Investment Member (CCIM) candidate.