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About Us


Keystone Consulting Group has expanded over the past two decades. With one of the largest and most experienced professional appraisal staffs in New England, we have the expertise to appraise and consult on a wide variety of property types. Furthermore, our size provides us with the resources and professional capacity to meet essentially any time frame. More specifically, it gives us the ability to respond to the demands and changes in scope often experienced when doing appraisal work.

Team members include Certified General real estate appraisers, research analysts (appraiser trainees) and administrative support staff. All appraisers and research analysts hold Bachelor’s degrees or higher. Our staff has the education and experience to provide excellent service to our clients in a timely and competitive manner. As a firm mandate, our staff is required to adhere to a broad continuing education program, which ensures our position on the forefront of appraisal standards and valuation techniques. 


Stephen M. Dylag

John P. Pryor
Chief operating officer

Cathy S. Sonnenberg

Teresa E. Vanga

Jonathan R. Warner

Susan G. Zuck


Why do you need a Certified real estate Appraiser?

Appraising real estate for partial interests, eminent domain and conservation easements typically present unique problems that you don't ordinarily encounter in appraisals for sale, refinance, insurance or other purposes. Therefore, selecting an experienced certified real estate appraiser is critical.