The late Don Macmillan was one of the world's most respected authorities on Deere & Company. He bought his first Deere tractor in 1943, was appointed the first Deere dealer in the United Kingdom in 1958, and went on to establish one of the world's foremost collections of Deere tractors and memorabilia. Working with Deere & Company, he authored John Deere Tractors & Equipment Volumes 1 and 2 and John Deere Tractors Worldwide, all published by the American Society of Agricultural Engineers. He is also the author of The Bigger Book of John Deere and John Deere Tractor Legacy.

Andrew Morland is a freelance photojournalist. He is the photographer of numerous Voyageur Press tractor books, including The Bigger Book of John Deere, Vintage Ford Tractors, and Classic Tractors of the World. He lives in Somerset, England.

Randy Leffingwell wrote his first book, American Muscle, while on staff at the Los Angeles Times. The book examined Times’ publisher Otis Chandler’s muscle car collection. American Muscle, published in September 1990, jump-started a love of book creation that led Leffingwell to leave the Times in 1995. By then, he had authored Porsche Legends and six other books.

To date, Leffingwell has authored more than 60 titles. These include a dozen Porsche titles ranging from general overviews—Porsche 75 Years: Expect the Unexpected, and The Complete Book of Porsche 911—to deeper explorations in Porsche Turbo and Porsche 911: 50 Years. He regularly travels to Germany to continue his Porsche-history research, and he has interviewed more than 200 Porsche engineers, stylists, model makers, racers, and managers.

While Leffingwell has tackled other subjects, including John Deere tractors, Harley-Davidson, and West Coast lighthouses, he admits he is almost addicted to Porsche’s story. In addition to his book work, he is historical editor for 000 magazine and Porsche Panorama. And for the past decade, he has been researching and writing an encyclopedic history of Porsche’s motorsports endeavors.

Leffingwell lives near Santa Barbara, California.