It's Not HBO Without Colin Callender. Colin Callendar, the president of HBO Original Movies since 1999, has announced he'll be stepping down from his post to "return to my entrepreneurial roots." After Carolyn Strauss, he's the second of the Chris Albrecht regime to resign since Albrecht himself was squeezed out following an embarrassing domestic assault arrest in Las Vegas. Callendar was the man behind HBO's prestige longform productions like Angels in America, Wit, Recount, and John Adams. He plans on forming his own production company next year, but has one swan song before he goes—the $200 million WWII drama The Pacific, from Steven Spielberg and Tom Hanks. With his exit, however, so closes the chapter on the once untouchable cable network's golden era. It's all bottled blood substitute from here. [LAT]