Jim Clark has tapped Art Shaw, a senior VP of electronic brokerage at Charles Schwab, to be chief executive of his latest venture, myCFO, the web site to help high net worth individuals manage their considerable piles of money. In addition, Frank Tirelli, a former managing partner of the western region for Deloitte & Touche will become myCFO’s chief operating officer. The site, which aims to provide each member with access to either a lawyer or accountant with a lot of experience from one of the large accounting firms, has been operational since May. Shaw was responsible for the launch and management of Schwab’s online trading web site.