PRINCIPALS
Top-level management assures smoothly run projects that exceed client expectations.
As owners, our principals are also the project managers for all commissions.

Stephen M. Chassee
Principal
Since 2007 Stephen has been an active member of the Illinois Association of School Business Officials (IASBO), and in 2013 was elected to serve on the Service Associate Advisory Committee (SAAC) for IASBO. In 2016, Steve was elected to serve as the Chairperson for the SAAC. In addition to IASBO, Steve is also an active member in Illinois Association of School Boards (IASB), the Illinois Associates of School Administrators (IASA) as well as the Suburban School Superintendents Association (SSSA). Before joining Green, Stephen served honorably for 8 years in the United States Marine Corps, and is a Veteran of Operation Iraqi Freedom II-2, and he brings that knowledge with him to Green and all of our clients. His anti-terrorism and safety and security expertise has helped numerous Districts prepare pragmatic Safety and Security plans. He also is a Veteran Advocate. He also assists our clients with their community engagement and referendum assistance needs, and provides them with the support necessary to run a successful referendum campaign. When not working, you will most likely find him outdoors with his two kids, fishing, hiking, skiing or he’s somewhere on or under the water. “Helping our clients provide learning environments to students, where they can feel safe and secure no matter what else is going on around them, is one of the most rewarding things we can do in schools. This allows them to learn at a high level, open their minds, and develop the skills needed to become lifelong learners”.

William H.R. Taylor
Associate Principal, AIA, CSI
Bill is a licensed architect having received his Bachelor of Architecture in Design from the University of Illinois, Chicago. He is a member of the American Institute of Architects (AIA), and the Construction Specification Institute (CSI). Bill is a senior project architect with the firm; assigning team members, coordinating with consultants and communicating with clients throughout design and construction. Bill takes pride in having his projects completed on time and within budget. When he’s not busy cheering his Chicago Blackhawks to another Stanley Cup championship, Bill, a lifetime hockey enthusiast, puts on his pads and skates year round at his local park district rink. During college, Bill participated in the University’s year-long study abroad program in Versailles France, where he had the opportunity to travel extensively. While studying French and European architecture, he met his Swedish born wife Maria. Together they have two daughters. “Architecture is the synthesis of art and science. An architect must use his knowledge of the building sciences to provide aesthetically pleasing, cost effective solutions that satisfy the client’s program, are responsive to the environment, and withstand the test of time.”
Todd R. Hannah
Associate Principal, AIA
Todd has served as project architect and designer on a wide variety of renovation and new construction projects for both K-12 and higher educational facilities, local municipalities, the Capital Development Board, state institutions and private business/ commercial clients. He has served as project architect and designer on multi-million dollar school construction and renovation projects for public school districts in Springfield, Spring Valley, Eureka, Waverly, Casey, Shiloh and Shelbyville. Todd is a detail oriented individual who is intimately involved with each aspect and each phase of a project, from project inception through construction close-out.

George T. Prosiliakos
Associate Principal, AIA, NCARB
George Prosiliakos began his architectural career as an intern with GreenAssociates during his college years and continued with GA following graduation, where he established a strong professional foundation and developed a lasting passion for architecture. He earned his Bachelor of Architecture in Design from the University of Illinois at Chicago. George is a licensed Architect, a member of the American Institute of Architects (AIA), and a certified professional through the National Council of Architectural Registration Boards (NCARB). For more than 22 years, George served as Principal of his own architecture firm, leading a diverse portfolio of architectural projects throughout the Midwest. We are pleased to welcome George back to GA as Associate Principal, where he brings more than 28 years of professional experience and a wealth of expertise to our PreK–12 educational clients. In addition to his work in education, George has a particular interest in faith-based architecture, with a passion for Orthodox Byzantine architecture. His work and interests have taken him to remote communities, including those in Southern Mexico and Guatemala. Outside of his professional pursuits, George places great importance on his Greek heritage and enjoys spending time in his parents’ native country of Greece. Most importantly, he cherishes time with his wife and their four children. Watching his children grow into young adults and helping guide them along the way has been the most rewarding experience of his life.

Andrew C. Jose
Associate Principal, LEED AP
Andrew's got a designer’s eye for aesthetics blended with an engineer’s technical precision. With over 28 years of experience, he is responsible for the day-to-day activities and coordination of projects. He works with internal resources and consultants, as well as maintaining communication with clients and answering any questions they may have regarding their projects. Since joining GreenAssociates in 2001, he has been a strong advocate for sustainable and efficient design.

Aaron C. Woessner
Associate Principal, AIA, NCARB, LEED AP
Aaron brings a spark of energy and enthusiasm to GreenAssociates. His creativity and positive attitude are channeled into each project he undertakes. Aaron believes that architecture has the ability to project emotion. He does everything in his power to make sure the architecture is both functional and projects the appropriate emotion to those who experience it.

