A recent story on NPR features insights on writing from the experts – the Justices of the United States Supreme Court. In 2007, Bryan Garner interviewed each Justice about legal writing and advocacy. Videos of the interviews can be seen here. Bryan Garner is a prominent legal writing scholar and author of The Redbook, A Dictionary of Legal Usage, and The Elements of Legal Style, as well as many others.
A link to a New York Times article based on the same series of interviews can be found here.