Showtime has boosted Bryan Byrd to VP of public relations and Jackie Ioachim to VP of consumer PR. Both execs report to Robin McMillan, senior veep, public relations. Byrd and Ioachim were most recently directors in the same area.Also, Showtime has hired Geof Rochester as senior veep, marketing. Rochester will oversee Showtime Networks’ corporate and affiliate marketing efforts. He joins the company from ISun Networks, where he was chief marketing officer.