What is the fine-grained topic of the following text: Before joining The Ohio State University Moritz College of Law faculty, Professor Huefner practiced law for five years in the Office of Senate Legal Counsel, U.S. Senate, and for two years in private practice at the law firm of Covington & Burling in Washington, D.C. Only return the topic.
Professor Huefner's legal career before joining The Ohio State University Moritz College of Law faculty