The Times’ obit leads off with how he played the father on The Patty Duke Show. But Schallert played in many genres and naturally had experience on spy television of the 1960s.
His roles included Frank Harper, one of the substitute partners for James West (Robert Conrad) in the fourth season of The Wild Wild West when Ross Martin was recovering from a 1968 heart attack. Harper’s appearance took place during the show’s only two-part story, The Night of the Winged Terror. Harper, like Martin’s Artemus Gordon, was a master of disguise. Schallert had appeared earlier in the series in other parts.
Another spy-related role for the actor took place in Get Smart, which gets a mention in The Times’ obituary.
While the typical William Schallert character was focused and serious, he expressed particular affection for an atypical role: the wildly decrepit Admiral Hargrade, a recurring character on the spy spoof “Get Smart” (1967-70), who operated in a perpetual state of confusion. (“He reminded me of my grandmother when she got dotty,” Mr. Schallert said.)
Get Smart actually ran from 1965 to 1970. Schallert’s appearances on the show were from 1967 to 1970, according to the actor’s IMDB.com entry.
Other roles of note for Schallert included: a doctor in a 1967 Mission: Impossible episode; an oily lawyer defending a medical “quack” in a first-season, two-part episode of Hawaii Five-O (the same reason he played Frank Harper on The Wild Wild West); and a guest part in the Sam Rolfe-created 1970s series, The Delphi Bureau.