What was the original profession of Otto Rohwedder, the inventor of sliced bread?

Otto Frederick Rohwedder, the 'father of sliced bread,' was a successful jeweler before dedicating his life to innovation. He used his expertise in precision watchmaking and tools to design the first automatic bread slicer. He even sold his three jewelry stores to fund the project. Despite a 1917 factory fire destroying his blueprints, he persevered until the first commercial sliced bread hit shelves in 1928.