Founded in 1895, the Essex County Park Commission was the first county park system in the nation. That year, the commission began its management of Eagle Rock. The reservation was designed by renowned architect Frederick Law Olmsted Sr., who also designed Central Park in New York City and the Capitol Grounds in Washington, D.C. Evident characteristics of the architect within the park are the winding roads, natural blended waterways, open fields, and overlooks, all of which combine to attract thousands of visitors each year. Eagle Rock Reservation explores many interesting and little-known facts about the park. Readers are introduced to Llewellyn Haskell, the founder of nearby Llewellyn Park, who first purchased land at Eagle Rock. Seen is the trolley that once served Eagle Rock as it emerged as a popular resort area. Included are the park's view of the New York City skyline and the Hundred Steps to Eagle Rock, the same steps that were ascended by visitors nearly one hundred years ago. Also seen is a never-before-published lab note written by Thomas Edison, documenting World War I experiments he conducted for the U.S. Navy at Eagle Rock.