Meet The Leadership Team

Our construction & development team brings a long resume of successful projects to each one of our clients.

Jack Sbertoli
Owner & Founder

Jack Sbertoli

With over 15+ years of construction management and general contracting expertise, Mr. Sbertoli has worked in a wide variety of site infrastructures including mixed-use, healthcare, cultivation, commercial office, industrial, retail, and residential development.
Liz Le Sbertoli
Director of Marketing

Liz Le

Ms. Liz Le brings nearly two decades of results-driven marketing and communications expertise to John Martin Corporation. Ms. Le provides senior-level, cross-functional expertise and extensive market knowledge across a wide range of B2B and B2C industries including BMO Harris Bank, Subaru, BMW, St. Regis, Hyatt to Principal Financial Group.
Owner & Partner

Marty McDonnell

With over 20 years of development and construction expertise, Marty has worked in a wide variety of industries include including mixed-use, healthcare, childcare cultivation, office, industrial, retail, hospitality and residential development.
Marty's oversight of all company operations, including all phases of the development process ensures exceptional output for our clients. Marty graduated from Marquette University with a Bachelor of Science in Civil Engineering and then went on to received his MBA from Washington University in St. Louis.
Director of Construction

David Albers

As Director of Construction, David helps to lead project delivery while supporting our project management and field operations teams. He’s an accomplished real estate and construction professional with strong business vision built on 15+ years experience and having total project execution value of $520M. David is a strong leader with a BS in Construction Management from Purdue University, an MBA from the University of Notre Dame and years of hands-on experience. He brings unique perspective as not only a general contractor but working several years on the owner-side of projects, which provides him a close and personal understanding of our clients’ needs.