### Instruction:
From the passage provided, extract the founders of Bloomberg L.P. Separate them with a comma.

### Input:
Bloomberg L.P. is a privately held financial, software, data, and media company headquartered in Midtown Manhattan, New York City. It was co-founded by Michael Bloomberg in 1981, with Thomas Secunda, Duncan MacMillan, Charles Zegar, and a 12% ownership investment by Bank of America through their brokerage subsidiary Merrill Lynch.

### Response:
Michael Bloomberg, Thomas Secunda, Duncan MacMillan, Charles Zega