Donald Ruthroff More about Donald Ruthroff With over 25 years of experience in architecture, Mr. Ruthroff has a wide range of experience, extending from production residential communities in the US and China to local neighborhood convenience centers. As a Principal and leader of DAHLIN’s neighborhood residential sector, Mr. Ruthroff’s strengths in design, site planning, entitlement services and project management are integral to DAHLIN’s design solutions. With training in both structural engineering and architecture, Mr. Ruthroff brings a well-rounded breadth of experience to his work. His experience and excellent eye for design have made him a distinguished and sought-after industry leader who is frequently invited to speak at industry conferences and to judge in industry award programs.