Jack Spencer was born in Sheffield during the 1930s. At the age of eleven, he gained a place at Sheffield School of Art. He began an apprenticeship with the renowned firm Walker & Hall at the age of fifteen. After completing his national service, Jack returned to Walker & Hall, working on product development and the manufacture of prototype products.
Jack Spencer left Walker & Hall to work with David Mellor, producing prototype cutlery and flatware designs. In 1966 he formed a creative partnership with another Sheffield craftsman, Keith Tyssen. In the two years that they worked together, commissions included silver flatware and cutlery for Barclays Bank and altar pieces for Churchill College, Cambridge.
Spencer then formed his business, Jack Spencer (Silversmith) Ltd, specialising in making modern, superbly crafted but affordable jewellery. The firm is now named Jack Spencer (Goldsmiths) Ltd and is part of British Silverware Ltd, based on Windsor Street. In 2001 the firm made a replica of the Rugby Football League Challenge Cup. The original was made by Fattorini & Sons of Bradford in 1869. The original had become too fragile for regular handling, so the replica is now presented to the winning team. The cup is said to have taken more than 800 hours to make and weighs over eight kilograms.
The firm was also commissioned to make a replica of the Sir Thomas Lipton Trophy. This was presented to West Auckland Football Club for their victory in the inaugural World Cup in 1909. The original trophy was stolen from their clubhouse in 1994. Jack Spencer's recreated the object, working from archival film footage and historic photographs of the trophy.