Civilian attendants included metallurgist Joachim Gans, scientist Thomas Harriot, and artist John White. Local D.C. metallurgist and chemical engineer Joe Mazia assisted with the conservation. An influential Indian metallurgist and alchemist was Nagarjuna (born 931). Underwater hyperbaric welding was invented by the Russian metallurgist Konstantin Khrenov in 1932. Later he worked as a metallurgist, consultant and partner in an engineering firm, ANAMET Laboratories. He is also a jeweller, a metallurgist, and a smuggler. Bell was an energetic and skilful entrepreneur as well as an innovative metallurgist. The first plastic was invented by Alexander Parkes, an English metallurgist. Budaraju Srinivasa Murty is an Indian metallurgist. McGann was born in Kensington, Liverpool to a metallurgist father and a teacher mother. Her great-uncle is the metallurgist Sir Peter Hirsch. This has been pioneered by American metallurgist Larry Kaufman since the 1970s. Other notable Littleton natives include metallurgist James M. Hyde. PMC was developed in the early 1990s in Japan by metallurgist Masaki Morikawa. His mother, Claire, was a teacher, and his father was a metallurgist.