Pruitt is currently Attorney General of Oklahoma. His qualifications seem to be opposition to federal environmental regulation, esp. that around climate change, and he's been a close ally of oil and gas companies (and received campaign support from them).
Yeah, he's just who we need helping to Protect the Environment.
Donald Trump Picks Scott Pruitt, Ally of Fossil Fuel Industry, to Lead E.P.A.
Mr. Pruitt, the Oklahoma attorney general, has been a key architect of the legal battle against President Obama’s climate change policies.
I expected him to nominate Ralph Nader. Didn't you?