My collaborator and friend Peter Scott is retiring today. I first met him in Liverpool during 1968-69 and have been collaborating with him since 1986 and quite intensely since 1994. He moved to The University of Michigan, Ann Arbor in 1987. I retired in 2005 but there have been periods of collaboration even after retirement. We still have two long papers in progress but the progress is slow as the work seems essentially complete. Peter has made several basic contributions to three dimensional manifolds without mentioning his results. His first famous paper Finitely generated three manifold groups are finitely presented appeared in 1973. A note of mine written for his sixtieth birthday here.