Step 1: Match each scientist to their known field.
Salim Ali is famous as India's leading ornithologist, known as the Birdman of India. M. S. Swaminathan is credited as the father of the Green Revolution in India for his work on high yielding wheat varieties. S. P. Singh is a noted Himalayan forest ecologist but not the founding figure.
Step 2: Identify the founding ecologist.
Ramdeo Misra established the discipline of ecology as a formal branch of study in India, setting up one of the first research schools in ecology and environmental science at Banaras Hindu University.
Step 3: Confirm by elimination.
Since the other three names are tied to ornithology and agriculture rather than founding the field of ecology itself, the title belongs to Ramdeo Misra.
\[ \boxed{\text{Ramdeo Misra}} \]