Timothy Wu, the Columbia Law School professor and author who coined the phrase “net neutrality,” is putting his theories into practice as senior adviser to the Federal Trade Commission on consumer protection and competition issues that affect the Internet and mobile markets.

On leave from Columbia since February, Wu, 39, is working on the FTC’s pending antitrust investigation into Google Inc. He’s also running the FTC’s policy-platform group, which he calls “an early warning system” for issues related to emerging technologies.