He is also President of Onion Flats LLC, an award winning development/design/build collective centered in Philadelphia. Mr. McDonald has been teaching and practicing for over 20 years with a focus on community development, multidisciplinary thinking and making high-performance building technologies and alternative construction methodologies. Through his research and practice, he, along with his partners at Onion Flats, has developed, designed and built some of the first LEED Gold and Platinum projects in the country and the First Certified Passive House, Net-Zero-Energy-Capable project in Pennsylvania. McNeil, Jr., Walter D. Executive Director