 Mike Dunn and Nuel Belnap visited the Wellington group during 1975–76, Donald Davidson in 1977, Leszek Szczerba (a colleague of Tarski) in 1977, and Segerberg briefly in 1979 (in 1971 the group worked through his recent Ph.D. thesis ‘An Essay in Classical Modal Logic’ (Segerberg 1971)). Many others spent time with the group. David Lewis first visited in 1971, and then for several months in 1976, thereafter becoming a regular visitor to New Zealand. Lewis and Ken Pledger, another member of the group, shared an enthusiasm for train timetables, which they exchanged eagerly. Pledger was a geometer from the Vic mathematics department who—like many—first encountered modal logic in Hughes’ and Cresswell’s 1968 book. Pledger worked on extensions of S3 and on a modal system lying somewhere between B and S5, and later spent a sabbatical at Warsaw University with Szczerba—another geometer—where he finished a Ph.D. on ‘Some Interrelations between Geometry and Modal Logic’.