His work focuses on preserving and enhancing the functioning of natural systems while effectively and attractively integrating human use. His academic research focuses on green infrastructure and sustainable site design, native plant communities and American Indian ethnobotany. He continues to practice professionally, and his work has included several LEED-certified buildings, including the LEED Platinum headquarters of the Southface Energy Institute in Atlanta, Georgia. Alfred is Chair of the Sustainable Sites Technical Advisory Group for the U.S. Green Building Council and is on the Board of Directors of the Athens Land Trust.