An old time homicide detective with questionable ethics, Matthews was friends with Harry and has known Dexter and Debra since they were children. Disgraced and forced into early retirement by LaGuerta, he agreed to help her pursue Dexter in return for his honorable reinstatement.
Born and raised in Chicago, Geoff Pierson began acting professionally there before moving on to the Yale School of Drama and then to theatre productions both in New York and around the country. Some of his favorite roles he's played in theatre include Angelo in Shakespeare’s MEASURE FOR MEASURE, Wang in Edward Bond’s THE BUNDLE, Valmont in LES LIAISONES DANGEREUSES, Teach in David Mamet’s AMERICAN BUFFALO, Roma in GLENGARRY GLEN ROSS, Bobby in SPEED THE PLOW, Stanley in A STREETCAR NAMED DESIRE, and Botts in EXACT CHANGE. In the 1980s he co-starred with George C. Scott on Broadway in TRICKS OF THE TRADE, then worked extensively in daytime television, notably starring for three years as Frank Ryan in ABC’s RYAN'S HOPE.
In the 1990s he appeared at the Westport Country Playhouse in FAR EAST, the Bay Street Theatre Festival in MEN'S LIVES and ALONE AT THE BEACH, and co-starred with Leslie Uggums in the world premiere of the Ethel Waters bio-play STRINGBEAN before moving to Hollywood to star in two primetime television series. He first played Jimmy Kelly in the ABC comedy hit GRACE UNDER FIRE, and then starred for five seasons as Jack Molloy in the WB’s riotous comedy UNHAPPILY EVER AFTER. Subsequently he went on to star in yet another comedy series, THAT 80s SHOW, which ran for one season on the FOX Network. In recent years, in addition to his performance as Brock in the stage play SECRET ORDER and Horace in the Pasadena Playhouse production of THE LITTLE FOXES, he has made numerous guest-star appearances in several television comedies such as RULES OF ENGAGEMENT and such dramas as LIFE, THE MENTALIST, MEDIUM, CRIMINAL MINDS, THE WEST WING, NYPD BLUE, VERONICA MARS, MONK, NUMB3RS, CASTLE, REVENGE, IN PLAIN SIGHT, and many more.
During seasons three and four of the FOX hit series 24 he portrayed the role of U. S. President John Keeler. He was featured in the television movies POSEIDON on NBC and the Hallmark Hall of Fame CBS movie VALLEY OF LIGHT. He has co-starred in several independent feature films such as ALREADY DEAD and VENOMOUS, as well as co-starring in the Sundance Film Festival selections SLEEPING DOGS LIE and WORLD'S GREATEST DAD. In other feature films he was seen as the Vice-President in the Warner Bros. film GET SMART and as Dexter Sr. in SOMETHING BORROWED. He’s been in two films directed by Clint Eastwood. First, CHANGELING, in which he co-starred in the role of crusading attorney S.S. Hahn alongside Angelina Jolie and then as A.G. Mitchell Palmer in J. EDGAR, alongside Leonardo DiCaprio. Scheduled for release later in 2013 he will be seen as Hilary Swank’s father in the film YOU'RE NOT YOU. He has appeared in every season of HBO’s BOARDWALK EMPIRE as Senator Walter Edge and is currently continuing his role as Dep. Chief Thomas Matthews on the smash Showtime series DEXTER.
After several years dividing his time between New York and LA, he now makes his home in Los Angeles.