Dr. William Kay Mangum, 91, of Greeley, passed away on November 27, 2023 at Pathways Hospice. He was born on July 30, 1932 in Ramah, NM to Clarence Leslie and Lora (Shields) Mangum where he grew up on the family ranch. He became quite a horseman at an early age, rounding up and breaking wild horses.

Bill graduated from high school in Las Vegas, NM and went on to receive his BA from New Mexico Highlands University in Las Vegas, NM in 1953, his MD from the University of Rochester School of Medicine in Rochester, NY in 1957 and served a rotating Internship at Denver General Hospital from 1957-58 and his Residency at St. Joseph Hospital in Denver from 1958-62. He became active staff at North Colorado Medical Center in Greeley, CO from 1962 until retiring in 1993 as a general surgeon. He served as Chief of Staff from 1973-74, Chairman to Department of Surgery from 1968-69 and Director of Medical Education from 1963-68.

Bill served as the President of the Colorado Chapter of American College of Surgeons from 1977-78, President of the Denver Academy of Surgery from 1980-81, Member of the Board of Directors at NCMC from 1986-93, Chairman of the Corporate Committee in 1990, Teacher of the Year Award in 1977-78 for Family Practice Residents and again in 1988-89 for Surgery Residents.

He was a member of the American College of Surgeons, Southwestern Surgical Congress, Denver Academy of Surgery, American Medical Association, Colorado Medical Society, Weld County Medical Society and the American Arbitration Association.

On September 18, 1976 he married Shirley Ann Kaser at the Church of Jesus Christ of Latter-day Saints in Greeley, celebrating 47 years. They enjoyed downhill skiing and travelling the world together and were active with the Boy Scouts through the church.

In his retirement, Dr. Mangum became more active with fly-fishing, tying his own flies, woodworking, tennis, and enjoying their mountain home in Glacier View. He wrote his life story, publishing and sharing copies with his family. He enjoyed playing the guitar, reading Navajo mysteries and especially being a grandpa and sharing his life experiences with his grandchildren. He developed the Medical Archives Department at NCMC, creating displays with historic materials and devices.

Thankful to have shared his life are his wife, Shirley, children; Brad Mangum, Diane Flowers, Peggy Beckedahl, Lon Briggs and Jeff Briggs and their spouses, 10 grandchildren, 19 great-grandchildren (expecting two more soon), his brother, Daryl Mangum and his sister, Karen Fox, as well as many nieces and nephews.

He was preceded in death by his parents.

A Life Celebration will be held at 10:00 a.m. Saturday, December 2, 2023 at Adamson with interment at Linn Grove Cemetery. In lieu of flowers, memorial gifts may be made to “Pathways Hospice” https://pathways-care.org/give-now/ in care of Adamson, 2000 47th Ave., Greeley, CO 80634. Friends may leave condolences at AdamsonCares.com.