Our People

Spacewerks - Joe Ditonto

Spacewerks - Will Goosen

Granger Group - Gary Granger

Spacewerks - Matt Hubbard

Spacewerks - Jeff Lehman

Granger Group - Greg Markvluwer

Spacewerks - Our People

Our veteran team of real estate and finance professionals combined with business-process experts, designers, and construction and property managers provide you with a single-source partner.

Meet our team.

Joseph Ditonto, AIA, LEED AP
Director of Design & Research, Spacewerks
Joe has 25 years of experience in the architectural and consulting arenas. He passionately leads strategic planning sessions for clients, facilitating multiple groups and facets of an organization’s operations. He has laser focus on the strategic effectiveness of the work environment, from the development of business objectives to the facilitation of an integrated delivery. Joe brings an expertise that encompasses strategic consulting, operational performance, workplace analysis and effectiveness, sustainable impacts measurement and long term facility planning. Joe’s previous experience is linked to companies such as Proctor & Gamble, Steelcase, Ohio University, Novartis, BellSouth, AOL, and United Health Group.


William A. Goosen, Associate AIA
Director of Operations, Spacewerks
Will has over 35 years of diverse experience in construction ranging from project management, estimating, procurement. He draws from his years of project management and field work to provide accurate budgets based from conceptual and schematic drawings. He has been involved in projects surpassing $250 million for corporate, healthcare, education, and government clients. His keen attention to detail and nose-to-the-grindstone work ethic combined with a passionate, positive outlook provides Spacewerks’ clients with assurance of on-time, on-budget projects. Will attended Almeda University where he received degrees in construction management and business management.



Gary Granger
President/CEO, Granger Group
Gary is the founder and owner of Granger Group. He has 30 years of experience and leadership in all phases of the development process. In 1997, Gary established Granger Group to pursue his vision of achieving an extraordinary level of excellence in delivering the built environment. With Gary’s leadership, Granger Group has established partnerships and relationships leading to more than $700 million worth of successful developments. Gary is active in the community serving on boards for the State of Michigan Chamber of Commerce, VanAndel Institute, and Ferris State University, just to name a few.



Jason Granger
Director of Development, Granger Group
Jason has five years of experience in commercial financing and development from the financial analysis stage through project
development and close-out. Jason joined Granger Group as Director of Development and has been intricately involved
in the development of Metro Health Village as well as other key projects. Prior to joining Granger Group, Jason was with
Independent Bank Corporation in Ionia, MI where he was a Director of Commercial Lending. His responsibilities included
commercial loan analysis, business case preparation, technology project development & oversight, as well as monitoring
asset-based lending policies.

Matt Hubbard
Director of Preconstruction Services, Spacewerks
For over 25 years, Matt has drawn from his design background and extensive construction expertise to deliver successful projects to a diverse mix of customers. From initial meeting through the entire construction process, he remains focused on the balance between budget, schedule and design. His ability to understand the goals and objectives of the project allows him to conceptualize the solutions early in the process. Matt has a pragmatic approach, starting with “hands-on” field experience and involvement with due diligence and the entitlement process. Matt’s previous experience spans across companies like Chrysler/Jeep, University of Michigan Hospital, American Red Cross, Comcast, Salvation Army, General Dynamics, General Mills, and NSF International.

Karen Kowalczyk
Project Manager Assistant, Spacewerks
Karen has worked in the Development/Construction profession for over 16 years as a project manager assistant. She was
instrumental in the development of the Metro Health Village Campus from infrastructure, to Retail Space, to The Granger
Green Park.  Her energetic personality and dedication to customer service provides the administrative support necessary to
manage and track the details of a project behind the scenes and keeps the line of communication fluent with owner, architect
and accounting.  Karen has provided her expertise in large projects such as (6) new Detroit Public Schools and the University
of New Mexico Science Lab to mention a few.



Jeff Lehman, EDAC, LEED AP
Director of Development, Spacewerks
Jeff has over twenty years experience in real estate development, sales, leasing, design, construction and management. During this time he has provided valuable real estate consultation to many clients and owners, helping them develop intelligent solutions to their real estate needs. He is experienced in pulling together the resources needed to help develop creative solutions for clients seeking to improve productivity in the workplace, better teaching and learning in educational facilities and improved outcomes and revenue generation in healthcare environments. Jeff has worked with organizations including Comcast, Fifth Third Bank Corporation, Pfizer, AAA, Michigan State University Federal Credit Union, United States Postal Service, Valspar Corporation, Spectrum Health and Medtronic, Inc. Jeff is a licensed real estate broker, a LEED Accredited Professional and has been awarded the EDAC designation (Evidence Based Design Accreditation and Certification) by the Center for Health Design.


Greg Markvluwer
Senior Vice President, Development & Financial Services, Granger Group
Greg has over 20 years of experience in commercial development from the financial feasibility state through project management and execution. He joined Granger Group in April 2000. Greg has successfully developed general office, educational, and governmental projects, medical campus developments, healthplex facilities and medical office buildings for businesses and hospital entities located throughout the United States. Greg has a master’s degree in business administration from Western Michigan University and is a licensed real estate broker and builder.



Barbara Powlison
Controller, Granger Group
Barbara joined Granger Group in February 2005 as Controller with fifteen years experience in various aspects
of construction, commercial and residential real estate and condominium construction. This experience was gained
with companies in the industry and with others where real estate and construction is an investment. She came to us
from Finsilver Friedman Management Corporation of Farmington Hills, Michigan overseeing the accounting for
condominium conversion projects as well as the related home owner associations, plus residential and commercial
real estate properties.

Laura Sullivan
Marketing Communications, Granger Group
Laura joined Granger Group in July 2007 as Graphic Designer with over five years of extensive experience in both print
and web design. She graduated with honors from Eastern Michigan University and obtained a bachelor's degree in graphic design. Previously, she worked for the Lansing State Journal where she created ad campaigns, collateral material, web design,
Flash commercials and more. In 2009, she won an American Graphic Design Award in brochure design for Granger Group.

Meet our team in-person – contact us.


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