Robert (Bob) Hall, 92, passed from this life on July 14, 2021. Bob was born in Kansas City, MO to Gerald and Josephine Hall on March 18, 1929. He grew up in Kansas City, MO and Houston, TX where he graduated from Lamar High School and then enlisted in the U.S. Marine Corp. After serving in the Marines, he attended the Univ of Houston and graduated with a Bachelor of Science degree in Petroleum Engineering in 1952. Bob eventually met his lovely wife Sarah while working in Tyler, TX as a Petroleum Engineer and they married in 1954. In 1959 he graduated with a Master's degree in Petroleum Engineering from the Univ of Houston where he also taught Petroleum Engineering evening courses for 10 years while working full time.In Houston, Bob worked for Continental Oil Company in the engineering and corporate planning departments. He also served as President and Executive Vice-President of Bayou City Steel Company in Houston from 1966 to 1969. Bob and Sarah had three daughters while living in Houston.Bob eventually took a position as Vice President of Doric Corporation, which relocated the family to Oklahoma City in 1969. In 1973, he became Vice President of Special Projects for Koch Oil International where he traveled all over the world developing pipelines, gas liquid systems, refineries and crude oil transfer facilities.Bob started Robert Hall Consultants, Inc. in 1975 as a petroleum consulting firm operating internationally and domestically. He was an advisor to African governments regarding refineries, phosphate mining and ammonia fertilizer plants and developed gas plant projects in the Middle East. He was a registered professional engineer with the state of Oklahoma.In 1980, Bob returned to the exploration and production field as President and Executive VP of Magic Circle Energy Corporation. He was instrumental in Magic Circle becoming a publicly traded company.In 1983, he started Hallco Petroleum Inc. where he was the General Partner for several private drilling programs and built, owned, and operated gas gathering and compressor stations.Bob was never afraid of a challenge. In 1990, he created and developed a proprietary system to capture and recycle freon from pharmaceutical waste. The company also disposed of pharmaceutical waste hence starting his company Enviro American Inc. In yet another entrepreneurial venture in 1989, Bob started Lea Land LLC and commenced building, owning, and operating a successful oilfield waste landfill in the Permian Basin area of SE New Mexico. Bob remained active in the day-to-day operation until the day of his passing. His daughters have worked in the business for many years. Bob was active in the Society of Petroleum Engineers, St. Eugene's Catholic Church, Quail Creek Country Club, and Reveler's Dance Club. Bob was the always the patriarch of the family and valued spending time with everyone as often as possible. Family vacations were very important to him, such as skiing, dude ranches, beaches, and cruising. He was preceded in death by his parents Gerald and Josephine Hall, and his wife of 59 years Sarah R. Hall. He is survived by his daughters, Saralyn Hall, Stephanie Grantham, Shelley Denton and husband Rob Denton, as well as grandchildren: Alise Wagner and husband Travis, Jonathan Grantham, Ryan Grantham, Reagan Denton, his great grandson Robert Wagner, and Bob's special friend Mary Beth Berney.Bob was a devoted and wonderful husband, father, and grandfather who will be missed by all who knew him and loved him. Mass of Christian Burial will be held at St. Eugene's Catholic Church, 2400 West Hefner Road, on Thursday, July 22nd at 11am with a short reception immediately following and a private interment at Resurrection Cemetery. In lieu of flowers donations can be sent to Sisters of Mercy/Mercy Convent, 4300 W. Memorial Rd., OKC, OK 73120.