John L Kennedy, 75, of Gillette, Wyoming died peacefully on August 23, 2023 in the comfort of his own home. John was born in Baltimore Maryland on March 31, 1948, to Eugene Paul and Mary Jean Kennedy. John attended Loyola-Blakefield High School and went on to pursue his education at Rollins College in Winter Park, Florida receiving his B.A. in 1970 and his M.B.A. in 1972 from the Roy E. Crummer School of Finance and Business Administration, Rollins College. John was also a proud veteran of the United States Army National Guard. He worked in the oil and gas industry as a Petroleum Landman since 1975. His profession took him everywhere across the United States. He came to Gillette with plans of only staying five months but ended up making Gillette his full-time home. He cultivated and retained lifelong friendships from his high school, college and landman days. John was a voracious reader, loved traveling, and enjoyed watching every single baseball game on TV, but especially when the Baltimore Orioles were playing. He was on cloud nine that they might make it to the World Series this year. Most of all, John enjoyed having a beer or two with friends and loved ones. He will be remembered for his sense of humor, kindness, and larger than life personality. John is survived by numerous cousins and friends he considered family. Preceded in death by his parents, brother Paul Kennedy and nephew Michael Kennedy. In memory of the extraordinary generosity and mentorship that John gave to the many people he brought into the landman business over the years and changed their lives for the better.