What are some of the leadership roles David Chubak held at Citigroup Citi?
He was the CEO of Citi Retail Services and CEO of US Retail Banking at Citigroup.
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### Instruction:
What are some of the leadership roles David Chubak held at Citigroup Citi?

### Input: Not applicable

### Response:
He was the CEO of Citi Retail Services and CEO of US Retail Banking at Citigroup.<|im_end|>