Robert Hamilton Boyle Jr. (August 21, 1928 – May 19, 2017) was an environmental activist, conservationist, book author, journalist and former senior writer for Sports Illustrated. In 1966, Boyle founded the Hudson River Fishermen's Association (HRFA) with its members serving as sentries to protect the river and its inhabitants, help reverse the deterioration caused by river pollution, and bring polluters to justice. The organization grew over the years, and in 1986, was officially renamed Riverkeeper after being merged with HRFA's Riverkeeper program. It was the first "keeper" group in the global Waterkeeper Alliance movement.