According to the American Association of University Professors' 2010-2011 salary data, full professors at doctoral institutions earn an average of $127,296; associate professors make $84,686; assistant professors take home $72,893; instructors earn $48,418; and lecturers make $55,520. When combined, full-time faculty members at doctoral institutions earn an average of $92,468 annually, according to the AAUP.
The Chronicle of Higher Education collated the AAUP salary data by institution type and also tabulated data from Oklahoma State University's unrelated 2009-2010 Faculty Salary Survey by Discipline. According to Oklahoma State's numbers, full professors in the health professions and related sciences earned 18.9 percent more than their colleagues in the English language and literature departments while engineering professors made an average of 25.2 percent more than their peers in English and literature.