Trivia

In 2011 at age of 74, he was the oldest winner of the Academy Award for Best Original Screenplay for The King's Speech (2010). He held this record for one year, until Woody Allen won for Midnight in Paris at the age of 76 in 2012.

When writing the script for The King's Speech (2010), Seidler discovered that his own uncle, also named David and also a stutterer, had been sent to see Lionel Logue by his father (Seidler's grandfather).

Seidler believed that his stutter might have been a response to the emotional trauma of the war. Thinking it would make others feel uncomfortable, as a teenager he often chose to keep quiet.

Seidler is most known for writing the scripts for the stage version and screen version for the story The King's Speech (2010). For the film, he won the Academy Award and a BAFTA for Best Original Screenplay.

He was a British-American playwright and film and television writer.