Halluin, 70, and Perchonock were headed to Pine Mountain Lake Airport in Groveland when the crash occurred. Halluin owned a mountain home in the area and often commuted by plane from there to his job in Palo Alto, the San Jose Mercury News reports.
The cause of the accident was not immediately known.
According to the web site of Wilson Sonsini Goodrich & Rosati, Halluin joined the firm in 2002 and was “one of the nation’s most prominent biotechnology patent lawyers.” Prior to joining Wilson Sonsini he was a partner at Howrey Simon Arnold & White.
Halluin was born in Washington D.C. and grew up in Silver Springs, Md. He earned a bachelor’s degree in biochemistry and organic chemistry at Louisiana State University and received his law degree from the University of Baltimore.
Marcus Halluin, one of two surviving sons, told the Mercury News his father began flying eight or nine years ago. Funeral arrangements for Halluin and Perchonock are still pending.