Buchanan Ingersoll & Rooney PC | 11,556 followers on LinkedIn. Buchanan Ingersoll & Rooney is a national law firm with a proven reputation for providing progressive, industry-leading legal, business, regulatory and government relations advice to our regional, national and international clients. Our 475 attorneys and government relations professionals across 17 offices proudly represent some of the highest profile and innovative companies in the nation, including more than 40% of the Fortune 500. While we service a wide range of clients, Buchanan has especially deep experience in the energy, finance, healthcare and life sciences industries.