Many academic librarians have ideas or opportunities for teaching information literacy courses for the library, outside the scope of their regular positions. Some additional librarians are asked to consider teaching credit-bearing courses for other departments at their institutions, based on graduate degrees they hold in fields besides library science. Academic librarians who face either option are often asked to provide detailed information on how colleagues at other institutions handle arrangements: payment, coverage of library services while they are teaching, and proving their suitability for teaching in a given subject area. Unfortunately, the data available on their work is both scant and scattered. The authors surveyed librarians at 350 academic libraries across the United States to gather and analyze data on these and numerous related aspects of librarians' teaching for departments outside the library. They also collected and analyzed comprehensive background information on these "professor-librarians."