He was, next to David Cronenberg and Atom Egoyan, one of the more interesting post-war Canadian filmmakers.
He also directed and Big Little Lies (2017) one of the few television series of the television series era I have seen.
Christopher Plummer was a Canadian actor best-known for his part in The Sound of Music.
In my universe, Plummer played parts in The Imaginarium of Doctor Parnassus, The Man Who Would Be King and Harrison Bergeron, an admirable adaptation of the wonderful short story by Vonnegut.
In Harrison Bergeron, Plummer is John Klaxon. Klaxon is the benevolent tyrant of the intelligent elite that gives the masses the illusion that they rule.
There seem to be quite a lot of differences with the short story, but I have not had time to check them out.
Update: I re-read the short story, which is only 6 to 7 pages long so there is barely opportunity to compare. In the short story the parents of Harrison are watching television, their son having been arrested some time before. The parents are watching television. All of a sudden the son is seen on television interrupting a ballet performance. The son speaks to the people, imploring them to free themselves from their handicaps. He ‘marries’ a ballerina and is subsequently and tragically shot.
The 2009 short film 2081 follows the short story faithfully.
The film version, with Harrison becoming part of the elite, is reminiscent of V for Vendetta, one of the best films of the 21st century.