Analyze the relationship between 'Turing Pharmaceuticals' and 'Martin Shkreli' within the context of the input sentence.
Options: founded by, headquarters location, legal form, position held

News (Other OTC: NWSAL - news ) headlines proclaimed Turing Pharmaceuticals CEO Martin Shkreli the "most hated man in America," and he soon vowed to roll back the price, but did not say by how much.
founded by