Concept:
Sam (Shyam) Pitroda is an Indian telecom engineer, inventor, entrepreneur, and policymaker. He is widely regarded as the architect of India's telecom revolution.
• Pioneer of India's telecommunications sector.
• Played a major role in introducing modern telecom technology.
• Served as the Chairman of the National Knowledge Commission.
Step 1: Recall Sam Pitroda's contribution.
Sam Pitroda contributed significantly to:
• Expansion of telecommunications.
• Technology-driven governance.
• Knowledge and education reforms.
Step 2: Identify the position held by him.
He served as the:
\[
\boxed{\text{Chairman of the National Knowledge Commission}}
\]
The National Knowledge Commission was constituted to recommend reforms in:
• Education.
• Research.
• Libraries.
• Innovation and knowledge systems.
Step 3: Compare the options.
• UGC Chairman -- Incorrect.
• NCTE Chairman -- Incorrect.
• National Knowledge Commission Chairman -- Correct.
• Rehabilitation Institute of India Chairman -- Incorrect.
Step 4: Final conclusion.
Hence, the correct answer is:
\[
\boxed{\text{National Knowledge Commission -- Chairman}}
\]