Harvey Sacks treated knowledge as being, primordially, of lay, commonsense status and gave us ways of analysing it, which — unlike conventional sociologies — did not conflate lay society-members’ concerns with those of analysts. Sacks’ respecification of the sociology of knowledge and culture might thus be conceived in terms of a number of ‘turns’: (i) a turn focalising the lay determinations of knowledge, (ii) a praxiological turn, focalising members’ practices, and (iii) a linguistic turn, concentrating upon the conjoint, in situ linguistic transaction of these practices. In addition — by virtue of his early and continuing association with the founder of ethnomethodology (EM), Harold Garfinkel — Sacks took a procedural or methodic turn, treating ordinary commonsense knowledge of social structures as ‘know-how’ rather than just ‘knowing that (something is the case)’. Sacks also laid claim to the invention of the analytical trajectory of conversation(al) analysis (CA), but how he arrived at it is not so easy to specify.