Reuben Singh is a British-Indian Sikh billionaire entrepreneur, the founder of alldayPA and CEO of Isher Capital. In the captivating world of business and luxury, one name shines brightly, echoing tales of entrepreneurial brilliance, extravagant lifestyles and a heartfelt commitment to philanthropy. Meet Reuben Singh, the Indian-origin Sikh billionaire whose journey from humble beginnings to…