The LambekFestschrift:

Special issues of MSCS and TAC in honour of Joachim Lambek's 75th birthday

The following papers have appeared in the Lambekfest issue of Mathematical Structures in Computer Science (Vol 10, No 2)

The following papers have appeared in the Lambekfest issue of Theory and Applications of Categories (Vol 6)

From the Introduction:
As friends, collegues, and students of Jim's for many years, we are pleased to be able to present to him this collection of papers, whose span covers much (unfortunately not all) of the territory Jim's own work has influenced so profoundly. We join the authors of these papers in wishing him well, and hoping to derive further inspiration from his research for many years to come.
The Editors: M. Barr, P.J. Scott, R.A.G. Seely

Photo by Barbara Mikolajewska