Lynwood Valentine Prest, PE (MSCE), President of GPR, is a registered professional engineer in 6 states, and has National Certification. In the Commonwealth of Massachusetts, Val is licensed as both a Civil and a Structural Engineer.  He previously owned his own firm for 12 years. In addition to his extensive and varied structural and civil engineering design activities, Val has also conducted many forensic engineering investigations into structural failures, and has acted as an expert witness in court. He has developed specialized techniques for epoxy repairs of timber framing and has presented a mini seminar on those procedures. Val is a recent Past-President of The Boston Association of Structural Engineers (BASE).

Bruce D. Ringwall (BLA), Vice President of GPR, is the former Director of Land Planning for Joseph R. Henry & Associates, Inc. of Harvard, MA. Bruce is a Certified Soil Evaluator and Title 5 System Inspector.  Having appeared before nearly every Planning Board, Conservation Commission and Board of Health in Central Massachusetts, Bruce is recognized as an expert in land planning, regulations, permitting and the approval process for land development in the area. Bruce also has considerable expertise in septic system design and permitting.

Calvin R. Goldsmith (BSE, MBA), is Vice President and Treasurer of GPR, and formerly worked for engineering offices in California, Connecticut, and Massachusetts.  Cal is a Licensed Construction Supervisor in Massachusetts and a Certified Title 5 System Inspector. He has extensive experience in land planning and development, site design, stormwater analysis and design, and in obtaining approval for projects from local Planning Boards and Conservation Commissions.  In addition, he is currently the consultant to the Maynard Planning Board, and was formerly an Alternate Zoning Enforcement Officer and Conservation Commissioner in the Town of Harvard, and the Chairman of the Harvard Planning Board.