Yes. A marketing agency can assume the role of a marketing department in an organization (“outsourced marketing”). This can especially make sense for smaller companies. For a retainer and yearly contract, the agency will endeavour to become expert in the industry, working closely with the owner or CEO, and not only run the operation, but provide board expertise to help the company grow strategically. This can be a cost-effective way to get senior-level marketing without incurring senior-level fixed costs.