In my opinion, it would be Dr Goh Keng Swee.
He was responsible for numerous projects, such as the Jurong Industrial Estate, Jurong Birdpark, Singapore Zoo, Underwater World Sentosa and much, much more.
He also establishes Naional Service and created streaming.
All his work has benefited the people during that time and now.
For Dr S. Rajaratnam, he wrote the Singapore Pledge, but it was for the racial harmony of people in Singapore.
That's what his work is all concepted under: harmony, racial rights and fairness.
Dr Goh's work is diverse, he has done work for the leisure of Singapore, the military of Singapore, the education system of Singapore, etc.
