Nationally renown Edison experts Robin and Joan Rolfs will be signing their latest book, Hearthstone: America's National Electrical Treasure.

The Rolfs have researched Edison for more than 30 years and are enthralled with Edison’s connection to Hearthstone. They have authored six books relating to phonograph advertising, Edison’s photographer, and Edison’s “Little Folks Furniture.” Their project on the Edison talking doll with the Thomas Edison National Historic Park in Orange, NJ was featured in the New York Times, on National Pubic Radio, and by other national news outlets.

“It is our hope that this book inspires young entrepreneurs to invent and invest in the future of technology as Edison and Henry J., Rogers did,” relates Robin Rolfs.

Copies will be available for purchase with the proceeds supporting Hearthstone. Signing is free with paid tour admissions.