Willem, an LTA R3 referee and National Referee course candidate, has revolutionised tennis competition through Cooper Events, which he founded at just 15. In 2024, his company ran 250 events across 10 venues, serving 25,000 players. Willem trains and manages officials, ensuring high-quality, inclusive tournaments at all levels. His leadership in prestigious events like the Paddington Grade 3 and Georgians Summer Open showcases his commitment to excellence in officiating.