In my experience, it has depended on the complexity of the integration and the preference of the business sponsors of the deal. Typically, the executive sponsor of the deal (usually at the SVP level) is committee ‘chair’, and then there is representation from the major work streams relating to the integration (finance, HR, IT, sales, etc.). The IMO is responsible for preparing the materials for and facilitating the meeting so much so that the steering committee meeting would not happen if it wasn’t for the IMO driving that interaction with the leaders and the discussion, so in a sense, the IMO is the shadow leader of the steering committee.