Mark David Webb, 65, retired chemical operator with PMC Biogenics, passed away Thursday, October 15, 2020, in Memphis.  The husband of Norma Yarbrough Webb, he also leaves his son Matthew L. Webb of Ocala, FL; sisters Sue McCanless of Oakland, Betsy Highland of Memphis and Lynn Cohen Hammami of Eads; and several grandchildren.  He was preceded in death by his parents, Jimmy and Helen Thompson Webb.