Karl E. Ludvigsen is a journalist, author, and historian of the automotive industry and motorsports. Karl Ludvigsen is the author of the definitive history of Porsche. His Porsche history, Excellence was Expected, is considered to be a model of the researching and writing of the history of an auto company. Ludvigsen is an honorary member of the Vintage Sports Car Club of America and the Corvair Society of America. He is also a member of the council of the Historic Automobile Group.