The AIMS Press journal “Mathematical Biosciences and Engineering” is publishing a special issue in honour of Stephen Gourley, a highly-respected Professor of Mathematics at Surrey, who died in September 2020 (see university obituary here). The volume contains contributions of colleagues and collaborators of Stephen from around the world, and is edited by Stephen‘s collaborators Professor Rongsong Liu (University of Wyoming) and Professor Feng-Bin Wang (Chang Gung University, Taiwan). The volume is in progress with a link to the current set of published papers here.