James MacGregor, director of advertising sales at the San Francisco Business Times, has been named publisher of the Silicon Valley/San Jose Business Journal, replacing Vintage Foster, who is resigning to start a business. Both the San Francisco and San Jose business publications are owned by American City Business Journals. Foster is leaving the paper on Aug. 31 to launch a communications and media services business, Armanino McKenna Foster, with San Ramon-based accounting and consulting firm Armanino McKenna LLP.