CAUTION: The Sender of this email is not from within Dalhousie. Dear Colleagues, John Power, recently retired and now an honorary professor at Macquarie University, turned 60 in December 2019. John has made substantial contributions to category theory and its applications to computer science throughout his career, including coherence problems, higher-dimensional categories, algebraic theories, algebraic effects in computation, and logic programming. To celebrate John's achievements, and to inspire further work, following the workshops for John at Bath (*) and at Kyoto (**) we are planning a Festschrift in Honour of John as a special issue of Mathematical Structures in Computer Science. The editors are Masahito Hasegawa (Kyoto), Guy McCusker (Bath) and Steve Lack (Macquarie). We welcome a range of contributions to the Festschrift, both original papers as well as survey papers related to John's work in a broad sense. All submissions will be reviewed according to MSCS' usual procedures. We plan the following schedule, aiming at publishing the special issue in 2021: Notification of intention to submit: 31 May 2020 Submission by: 30 November 2020 At this point, we are looking for expressions of an intention to submit, which should be sent to Masahito Hasegawa <hassei@kurims.kyoto-u.ac.jp> by 31 May 2020. (*) A Workshop for John Power 27 June 2019, University of Bath organized by Neil Ghani and Guy McCusker http://www.cs.bath.ac.uk/~gam23/JohnPowerWorkshop/ (**) A Workshop in Honour of John Power on the occasion of his 60th Birthday 23 December 2019, Kyoto University organized by Masahito Hasegawa, Ichiro Hasuo and Makoto Takeyama http://www.kurims.kyoto-u.ac.jp/~hassei/ajp60/index.html Best regards, Masahito Hasegawa Guy McCusker Steve Lack [For admin and other information see: http://www.mta.ca/~cat-dist/ ]