America's first and finest designer of public parks and green spaces, Frederick Law Olmsted was the force behind Manhattan's Central Park and the preservation of Yosemite and Niagara Falls. Yet his close friend and sometime collaborator Henry Hobson Richardson is nearly forgotten, despite creating such masterpieces as Boston's Trinity Church and dragging our national architecture out of the quagmire of Victorian gingerbread ornament and endless reiterations of the Parthenon. As he did in Architecture's Odd Couple: Frank Lloyd Wright and Philip Johnson, Hugh Howard creates a fascinating dual portrait that brings out the best in two visionary designers who reimagined the American landscape in the post Civil War era.