John Montagu, 11th Earl of Sandwich net worth: John Montagu, 11th Earl of Sandwich, is a British politician, entrepreneur, and nobleman who has a net worth of $100 million dollars. John Montagu was born in England, and went on to graduate from Eton College and Trinity College, Cambridge. He is the oldest son of Victor Montagu, who actually rejected the title of Earl in 1964. John Montagu became the Earl of Sandwich in 1995. He owns the Earl of Sandwich Sandwich Shop in the Walt Disney World Resort, and is also a cross-bencher in the House of Lords. He is known for focusing on initiatives related to international development and asylum. He is the father of Luke Montagu, and the father in-law of Julie Montagu. Luke and Julie are currently appearing on the Bravo reality series, “Ladies of London”, which follows a group of successful women and their families based in London. The entire Montagu family appears on the show.