Westrum Development Company has withstood the challenges of the last 3 decades through the tenacity and experience of its leadership. Both singularly and collectively, our executive team drives the vision of the company forward through strategic investments and acquisitions, innovative sales, leasing and marketing campaigns, keen analysis of market data, and consistent involvement with government agencies and community groups.


John Westrumnew Westrum headshot080615

Founder, Chairman, and CEO

John is a visionary business leader with over 30 years experience in real estate and land development; established Westrum Development Company in 1987.


  • Nationally recognized Leader in Urban Revitalization
  • Experience in Local and Regional Government:
    • Past President of Bucks/Montgomery County Home Builders
    • Board of Directors – Bucks/Montgomery County Home Builders
    • Past President of BIA of Philadelphia, NAHB
    • Only Individual to serve as President of both the HBA and BIA
    • Board of Directors – BIA of Philadelphia, NAHB
    • Board Member – Philadelphia Zoning Code Commission, PA State Planning Board
    • Committee member of the Urban Land Institute
  • Quoted Expert in the areas of Urban/Suburban Revitalization, Redevelopment, Sales and Marketing, and Land Acquisition
  • Co-author of Philadelphia 10 Year Tax Abatement Case Study, 2014
  • Philanthropic ventures include: Philadelphia Mural Arts Program, Ambler Theater, Schuylkill River Development Corporation, Berkshire Hathaway HomeServices Fox & Roach Charitable Foundation


JNEw Mershonohn Mershon

Named a 2016 CFO of the Year Honoree by the Philadelphia Business Journal

Partner, Chief Financial/Operating Officer

John has a proven 30 year track record in the areas of creative financial management, investor relationships, strategic operations, and risk mitigation. John has been with Westrum Development Company nearly 20 years.

  • Creates and manages Financial, Tax and Management Controls
  • Maintains and Generates new Investor and Lender Relationships
  • Successfully develops and communicates Business Plans, Financial and
    Operating Strategies to Lenders, Investors, Owners, and Boards
  • Provides Critical Thinking Analysis to successfully implement New Business
    Opportunities, both Operationally and Financially
  • Experienced at Valuing and Acquiring Companies, from Initial Negotiations through Closing the Transaction
  • Cultivates Cooperative Relationships with Lenders
  • Raised more than $100 Million in equity to date

Executive Team

Jon Herzog, Chief Operating Officer



Brian McKenzie, Vice President,  Homebuilding



John Tallman, Vice President, Approvals



Josh Allen, Vice President, Multifamily Assets



Lori Giaquinto, Controller