One of Locklair's pieces, "The Peace may be exchanged" (from Rubrics), was performed at the funeral service for former President Ronald Reagan at the Washington National Cathedral.
From 1984 until May 1994, he volunteered as the rare-book librarian for the Washington National Cathedral.
In 2010, the choir completed a tour of the United States, where it toured the East Coast and performed at numerous places including the Washington National Cathedral in Washington D.C..
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He made stained glass windows for the University of London (Goldsmith' Library in the Senate House Library), Tate Gallery ("The Angel Blesses the Women Washing the Clothes"), the Victoria and Albert Museum ("Noli me tangere"), as well as cathedral glass for the York Minster, the memorial chapel for President Woodrow Wilson in Washington National Cathedral in Washington D.C. and Canterbury Cathedral.
In 2011 the Lonely Planet guide included the monument to Arthur Wellesley, 1st Duke of Wellington in its list of the "top 10 most bizarre monuments on Earth", along with the Rocky Balboa statue in Žitište, Serbia and the Washington National Cathedral in the United States.
Dr. Knapp serves on the boards of directors of the Economic Club of Washington; the Greater Washington Urban League; the World Affairs Council; and the National Symphony Orchestra and the boards of trustees of the Washington National Cathedral Foundation and Al Akhawayn University in Ifrane, Morocco.