Michael Francis Duffy, Sr., founder of Ranch Cryogenics, Inc., died on Tuesday, June 30, 2020 at ProHealth Waukesha Memorial Hospital in Waukesha, Wisconsin. He was 84. Michael Duffy was born in Milwaukee, Wisconsin on February 16, 1936 to the late Frank and Celia Duffy (nee Braun). He married his cherished wife, Barbara Molthen, and together they raised their son Michael Jr. He worked several jobs early in life and co-owned a gas station on Bluemound Road before becoming a truck and trailer mechanic for Northern Gases in Waukesha in 1966. He went on to operate and manage several air separation plants, then found a niche when he moved two gaseous oxygen plants from Chicago to Waukesha. His beloved wife, Barbara, passed away in 1984. He was inspired to start Ranch Cryogenics in 1987, running relief operations for other plants. The following year he sold and installed a CO2 plant in Sterling, PA and Amarillo, TX. In 1990 he again expanded his family when he married the love of his life, Carol Starkey, and welcomed her children, Virginia, Patricia and Dean, into his life. His job took him all over the world. He managed projects in Brazil, Turkey, South Korea, and Mexico. One of his favorite jobs involved moving a plant from Texas to Papua, New Guinea, where local tribes provided the labor for reassembly. Mr. Duffy, who remained active at RCI, liked to tinker with antique cars and entered his vintage Model A regularly in the Savannah, Georgia St. Patrick’s Day Parade, where he participated each year along with family and friends. He also enjoyed fishing and spent many warm summer days and nights on Pewaukee Lake. He embraced the simple things in life and looked forward to cutting his grass on his riding lawnmower. In addition to his parents, Mr. Duffy was preceded in death by his first wife, Barbara (nee Molthen); sister Catherine Schmidt (Duffy); great – grandson, William Duffy; and grandchildren: Dallas Briel and Nate Edleman. He is survived by his loving wife of 30 years, Carol (nee Starkey); a sister, Patricia Lukach of Wauwatosa; a brother – in – law, Ralph Schmidt; four children: Michael Francis Duffy Jr. (Sue) of Waukesha, WI; Virginia Mae (nee Parsons), wife of Brian Rutkowski, Birdsboro, PA; Patricia Ann Briel (nee Parsons) of Waukesha; and Dean Parsons of Boyertown, PA. He is also survived by his grandsons: Christopher (Tiffany) Duffy of Morris, IL; and Michael (Erin) Duffy III of Gardner, IL; his beloved great-grandsons: Christopher Jr., Alexander, Maxwell, Elliott and Dashiell Duffy; Christian Lee and Kevin Ferrari; and cherished granddaughter, Marlana Ferrari. Also surviving are his treasured grandchildren: Marcus Edleman, Carolyn (Edleman) wife of Mike Barron, Nolan Barron, Shawn Rutkowski, Chase Rutkowski, Daniel Dunsmore, James Dunsmore, Jeffrey Briel, Kyle Genard, husband of Lindsay, Kamryn Genard, Brandon Genard, Macklin Genard, Ashlie Berghold and Zackary Parsons; two brothers-in-law: Clinton Jay Starkey (Betty), of Royersford, PA and John Nelander (Betty) of West Palm Beach, FL; and many nieces and nephews. A celebration of Mr. Duffy’s life will be held Friday, July 10, with visitation at 4 p.m. at Cesarz, Charapata & Zinnecker Funeral Home, 237 N. Moreland Blvd., Waukesha, WI 53188. A memorial service will follow at 6 p.m. Please donate to a charity of your choice in lieu of flowers.