David founded the furniture company Linley in 1985. He married Serena Alleyne Stanhope at St. Margaret's church in Westminster in Oct. 1993, and they have two children together; son Charles Patrick Inigo Armstrong-Jones, Viscount Linley, born in 1999, and daughter Lady Margarita Elizabeth Rose Alleyne Armstrong-Jones, who was born in 2002, just three months after Princess Margaret's death. You might remember a young Lady Margarita as one of Prince William and Kate Middleton's wedding bridesmaids back in 2011.
In Feb. 2019, it was reported that the Earl of Snowdon is working on a biography of his late mother that will include her correspondence and information from historians and the Royal Archives at Windsor Castle.