Aside from CEO of US Retail Banking, what other key leadership role did he hold at Citigroup?
He also served as the CEO of Citi Retail Services.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Aside from CEO of US Retail Banking, what other key leadership role did he hold at Citigroup?

### Input: Not applicable

### Response:
He also served as the CEO of Citi Retail Services.<|im_end|>