Kenneth Meseroll (born 15 April 1952; age 73) is the actor who played McDowell in the Star Trek: The Next Generation fifth season episode "The Next Phase".
Meseroll was born in Highland Park, New Jersey, USA. Prior to his appearance on Star Trek, he voiced Derek Wildstar in the animated television series Star Blazers (1979) and had a guest role in an episode of The Cosby Show (1991). His only other acting credit in the 1990s is Lansky (1999, with Michael Krawic, David Selburg, James Harper, Robert Miano, Peggy Jo Jacobs, Scott Haven, Tom Towles, Francis Guinan, Bert Remsen, Michelle C. Bonilla, James Noah and Maury Ginsberg).
Since 2000 he appeared in the television drama The 70's (2000, with Tina Lifford, Leslie Silva, Robert Joy, Jeannetta Arnette, David Gautreaux, Buck McDancer, Hassan Nicholas, Mark Rolston, Michael Rothhaar, David Ruprecht and Jack Shearer), the television drama After Diff'rent Strokes: When the Laughter Stopped (2000, with Corey Mendell Parker), and in the sport drama Carman: The Champion (2001, with Michael Nouri, Scott L. Schwartz, Zack Duhame, Manny Perry and Michael Muñoz).
More notable, Meseroll appeared in episodes of Family Law (2000, with Julie Warner, Henry Darrow, Christopher McDonald, and Salli Elise Richardson), The X-Files (2001, starring Gillian Anderson, with Dan Desmond, Scott MacDonald, Wade Andrew Williams and Jennifer S. Parsons), Crossing Jordan (2002, starring Miguel Ferrer), The Practice (2003, with Jim Lau), CSI: Miami (2004), Numbers (2005, with J. Paul Boehmer and Amanda Carlin), The West Wing (2005, starring Martin Sheen, with Ron Ostrow), ER (2006, with Scott Grimes and Michelle C. Bonilla), Criminal Minds (2007, with Billy Brown and Sofie Calderon), Shark (2008, with Jeri Ryan, Sterling Macer, Jr., Kathleen Garrett, James Black, and Joseph Will), Without a Trace (2007 & 2008, with Enrique Murciano, Bill Smitrovich, Cullen Douglas and Lou Simon), Cold Case (2008, with Steven Anderson and Marlene Forte), Medium (2009, starring Jake Weber), and Mad Men (2009).
Following a leading role as Fred Hesse in 10,000 Days in 2010, Meseroll guest starred in episodes of Criminal Minds (2010, with Michael Reilly Burke and Evan Dye) and Grey's Anatomy (2010, directed by Allison Liddi).