Muhammad Yunus from Bangladesh. Founded the concepts of micro-credit & micro-finance in Bangladesh. This solved the problems of poor entrepreneurs who were unable to get traditional bank loans.
Lee Kuan Yew from Singapore. He was the prime minister of Singapore from 1959 to 1990. He made a Singapore from a third-world country to a first-world country within a single generation. Thus, he solved all problems Singapore faced as a third-world country.
Winston Churchill from UK. He was the prime minister of UK from 1940 to 1945. He led the British Empire to victory against impossible odds – defying the Nazis when rest of the allies had been defeated by the Nazis.
Bill & Melinda Gates from USA. They are the founders of the Bill & Melinda Gates foundation. They work on different problems in communities across the world. They work on problems that get too little attention and make the world inequitable.