Take context from the input text and decide on the accurate relationship between 'Turing Pharmaceuticals' and 'Martin Shkreli' from the options provided.
Options: legal form, founded by, position held, headquarters location

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