Some consultants join McKinsey as subject matter experts. These experienced professionals bring profound knowledge of an industry or functional area to their roles. Specialists divide their time between client and knowledge-building work, though the mix varies from person to person. The type of client work can vary as well. While some specialists fill full-time roles on engagement teams, others consult on client engagement teams rather than directly with clients. Many specialists go on to become experts in their sector or functional area.