Actor. He is best remembered for his reoccurring portrayal of the staunch Detective Brennan on the sitcom "My Favorite Martian". After attaining his degree in theatrical arts from Dartmouth College, he began his career on the stage appearing as a leading man on Broadway in such productions as "Idiot's Delight," "The Taming of the Shrew," "Love's Old Sweet Song," "The Seagull," "Call Me Madam," and "Death of a Salesman". While attending a dinner party at the prestigious Sardi's Restaurant, he was introduced to director John Roeburt. Impressed by his slim physique, distinctive voice, and dry sense of humor, he took notice of his potential and arranged for him to begin a career in the television industry beginning with him being under his supervision per a supporting role in an episode of "Inner Sanctum". From there, he would go on to flourish as a notable character actor appearing in over 95 features; often typecast as comic foils, curmudgeons, landlords, neighbors, doctors, authority figures, soldiers, aristocrats, educators, white-collared workers, retail clerks, politicians, husbands, fathers, and patriarchs. He appeared in such feature films as "A Private's Affair" (1959), "The Absent Minded Professor" (1961), "Days of Wine and Roses" (1962), "Son of Flubber" (1963), "The Misadventures of Merlin Jones" (1964), "How to Murder Your Wife" (1965), "The Horse in the Gray Flannel Suit" (1968), "Sweet Charity" (1969), "R.P.M." (1970), "The Barefoot Executive" (1971), "Now You See Him, Now You Don't" (1972), and "The Seniors" (1978). On television, he became a familiar face appearing in numerous guest spots on such syndicated programs as "Front Row Center," "Robert Montgomery Presents," "The Thin Man," "Peter Gunn," "The United States Steel Hour," "Armstrong Circle Theatre," "Alfred Hitchcock Presents," "Sugarfoot," "Peter Loves Mary," "National Velvet," "The Barbara Stanwyck Show," "Bachelor Father," "Pete and Gladys," "Leave It to Beaver," "Angel," "The New Breed," "Maverick," "77 Sunset Strip," "Dennis the Menace," "Espionage," "I'm Dickens, He's Fenster," "The Lucy Show," "Hazel," "Perry Mason," "Bewitched," "Profiles in Courage," "Kraft Suspense Theatre," "The Magical World of Disney," "F Troop," "Please Don't Eat the Daisies," "Slattery's People," "Dr. Kildare," "Insight," "I Dream of Jeannie," "Gomer Pyle: USMC," "Daktari," "The Wild Wild West," "Iron Horse," "The Danny Thomas Show," "Love, American Style," "Ironside," "The Bob Newhart Show," "Maude," and "Hec Ramsey". During his career, he was an honorary member of Actors Equity, was a member of the Screen Actors Guild, had been supportive of the Motion Picture and Television Fund, served in the United States Army during World War II, was an active parishioner of the Catholic church, had been a member of the Hollywood Democratic Committee, presided as a chairman for his local charters of the American Red Cross and St. Jude's Children's Research Hospital, was one of the founding members of the Canyon Theatre Guild, and had been a theatrical instructor for the Pasadena Playhouse. Upon his 1978 retirement, Hewitt, who never married nor had any children, relocated to his native New York and spent the final years of his life being a generous benefactor for several libraries and colleges, and was focused on several charitable and religious causes, until his death from the complications of cancer.