According to gun writer Gary Paul Johnston:
Mr. Richard Swan, inventor of the Swan Rail, which was adopted as the Mil-Std-1913 rail, and was nicknamed the “Picatinny” rail, passed away at home in his sleep the night of July 3rd after an illness.
Dick Swan also designed numerous mounting systems for the U.S. Military from the early 1990’s to the present, many of which continue to be used and copied through the world.