Step 1: Recall appointment. Kaushik Basu, a noted Indian economist, was appointed as the Chief Economist and Senior Vice President of the International Monetary Fund (IMF). Step 2: Background. He has served earlier as the Chief Economic Adviser to the Government of India. Step 3: Conclude. Hence, the correct answer is IMF Chief Economist & Senior Vice President.
\[
\boxed{\text{Chief economist and senior vice president of IMF}}
\]