Refer to the input text as context and select the correct relationship between 'Turing Pharmaceuticals' and 'Martin Shkreli' from the available options.
Options: headquarters location, legal form, founded by, 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