Dr. Brad C. Klein, MD is the co-author of an influential article in the academic journal Headache reviewing the use of peripheral nerve blocks for headache disorders. Fifteen members of the American Headache Society, including Dr. Klein, conducted a review of the existing literature and worked to develop a standardized procedure for nerve blocks. After years of work, they arrived at an expert consensus regarding the proper application and technique. This article represents the culmination of that effort.