After his retirement he participated in the 2011 World Green Energy Symposium, which was held in October 2011 at the Pennsylvania Convention Center in Philadelphia, Pennsylvania.
Consulting Curator for the Pennsylvania Convention Center since 1995, she has supervised commissioned works by Jones and Ginzel, Mei-ling Hom, Judy Pfaff, John Scott, among others.
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Blackwell was also heavily involved in legislation to create the Pennsylvania Convention Center and in passing the law that broke Philadelphia's long-standing building height limit, allowing for the construction of Philadelphia's One Liberty Place.