1. Learn enough about the subject
Learn enough about the subject to help an expert explain it accessibly without reducing its substance. An engaging explanation is not a less knowledgeable one: pitching a subject appropriately can require more understanding, not less. Do your homework before the interview so you can consider how the expert's knowledge might be explained to people with different levels of experience. A Wired series in which experts explain subjects to audiences of different ages and experience illustrates the principle: knowing a subject thoroughly helps people find different ways to explain it. Preparation should support that translation, rather than strip out complexity.