This document discusses the history of healthcare information systems (HIS) consulting firms through four epochs: the 1970s dominated by the "Big Eight" accounting firms; the 1980s rise of boutique firms; the 1990s rise of large consulting giants; and the 2000s of mergers and consolidations. It provides examples of some of the early pioneering consulting firms and individuals from each epoch. The Big Eight firms initially dominated the HIS consulting field due to their close client relationships from auditing work. Over time, this led some to question whether their recommendations were truly objective.