More important is to appoint someone with the right motivations and with a technical background. A pilot with a good formal technical background might be a fine FAA leader, but so might someone with technical expertise in the operations of the national airspace, or a Chief Engineer type involved with aircraft certification. What's critical though is that they remember they are supposed to work on behalf of the people, not the short-term economic interests of the regulated, and not to see themselves as firstly serving political patrons.