Step 1: Understand the role of the Chief Election Commissioner (CEC).
The CEC heads the Election Commission of India and is responsible for conducting free and fair elections across the country.
Step 2: Recall the name of the most famous CEC.
T.N. Seshan is arguably the most well-known CEC in India's history. He served as the 10\textsuperscript{th} Chief Election Commissioner from 1990 to 1996.
Step 3: Know his significance.
He is widely credited with transforming the Election Commission and rooting out electoral malpractices. He strictly enforced the Model Code of Conduct and a host of other reforms that cleaned up the Indian electoral process, earning him both praise for his integrity and criticism for his unyielding approach. His tenure is seen as a golden age for the Election Commission.
Sukumar Sen was the first CEC of India.