(written from a Production point of view)
Following his featured roles in the second and third season of Voyager, he portrayed a Vulcan adviser in the first and second season of Enterprise. He was identified by the call sheet for "Broken Bow" and the name tag of his costume which was sold off on the It's A Wrap! sale and auction on eBay and was also worn by regular background actor Louis Ortiz. 
One of Acker's most recent roles was that of one of a reporter in the drama Frost/Nixon (2008, with Andy Milder, Geoffrey Blake, Clint Howard, Ned Vaughn, and Googy Gress). Acker is maybe best known for his recurring role as Norman the doorman in the comedy series The Suite Life of Zack and Cody (2006-2007, along regular Kim Rhodes).  
He also had supporting roles in the television series Vital Signs (1997), the science fiction film Moonbase (1998, with Robert O'Reilly), the television movie Unauthorized Brady Bunch: The Final Days (2000, with Lisa Wilcox, Robert Curtis-Brown, and David Selburg), and the comedy sequel Scary Movie 2 (2001, with Woody Bosco, Drew Renkewitz, Suzanne Bianqui, Mark Barrett, LaFaye Baker, Tim Rigby, Bridgett Riley, Chris Palermo, Mike Gunther, Craig Shugart, and Geneviere Anderson).