Judges interested in diversifying the ranks of the clerks they hire—in terms of law school alma mater, ideology, socioeconomic background, gender, race, or ethnicity—often fail to tap their colleagues for tips on how they’ve broadened their own pool of candidates. 

That’s the key takeaway from a new study on law clerk selection and diversity based on in-depth interviews with 50 federal appeals court judges conducted by retired U.S. District Judge Jeremy Fogel, now executive director of the Berkeley Judicial Institute, Mary Hoopes, an associate professor at Pepperdine Caruso School of Law, and Justice Goodwin Liu of the California Supreme Court.