The term "professors" in the United States refers to a group of educators at the
college and university level. In the United States, while "Professor" as a
proper noun (with a capital "P") generally implies a position title officially bestowed by a university or college to faculty members with a PhD or the highest level terminal degree in a non-academic field (e.g., MFA, MLIS), the common noun "professor" is often used casually to refer to anyone teaching at the college level, regardless of rank or degree. At some
junior colleges without a formal ranking system, instructors are accorded the courtesy title of "professor". Although almost all tenured professors hold doctorates, some exceptional scholars without them are occasionally granted tenure:
Jay Forrester (electrical engineering,
M.I.T.) had only a master's degree;
Saul Kripke (philosophy,
Rockefeller) and
Andrew Gleason (mathematics,
Harvard) had only a bachelor's degree;
Edward Fredkin (computer science,
M.I.T.) and
Erik Erikson (psychology, Harvard) did not even have bachelor's degrees. Tenure without a doctorate is somewhat more common in fields with an artistic component, as with
Howard Nemerov (poetry,
Washington University in St. Louis) and
Colin Rowe (architectural history and theory,
Cornell). Until the middle of the 20th century, professors without doctorates were more common.
Tenured and tenure-track positions These full-time faculty members with PhDs or other highest-level terminal degrees (designated as acceptable by a university or college, including the "professional equivalent" to the doctorate at institutions such as
Columbia University), engage in both undergraduate and graduate teaching, mentoring, research, and service. Only faculty in these positions are eligible for
tenure. •
: An introductory level professor. A position generally taken after receiving a PhD and often, especially in the sciences, completing a post-doctoral fellowship. After 7 years, in most American colleges and universities, a tenure-track faculty member (usually assistant professor) must be
either awarded tenure, or dismissed from the university. •
: A mid-level, usually tenured, professor. •
Professor (sometimes referred to as
"Full Professor"): a senior, tenured professor. •
Distinguished Professor or
Endowed Chair (e.g., "the Brian S. Smith Professor of Physics"): An honorary position in which a full professor's salary may be increased, perhaps by being tied to an endowment derived from the university, private individuals, firms, or foundations. The top
administrative post in many academic departments is the "department
chair." Prior to the 1970s, such administrators were called "chairmen" or "chairwomen", but the term in most institutions has since been the gender-neutral "chairperson", or shortened to "chair". While many department chairs also hold endowed chair positions, the two positions are distinct. Educators who hold a formal title of "Professor" (referred to as tenured/tenure-track faculty) typically begin their careers as
assistant professors (or "lecturers" and "senior lecturers"), with subsequent promotions to the ranks of
associate professor and finally
professor. The titles are historical traditions; for example, it is not implied that an assistant professor "assists" more senior faculty. There is often a strict timeline for application for promotion from assistant to associate professor, most often 5 or 6 years following the initial appointment. Applicants are evaluated based on their contributions to research, teaching, and administration. The relative weightings of these contributions differ by institution, with PhD-granting universities usually placing more emphasis on research and
liberal arts colleges placing more emphasis on teaching. The decision to grant tenure and promotion from assistant to associate professor usually requires numerous levels of approval, with a common sequence being: • external reviewers—several nationally or internationally prominent academics in the candidate's field will be asked to review the candidate's application for promotion and submit a confidential report; • based on this report and evidence of the candidate's accomplishments in his or her curriculum vitae, a committee of members from the candidate's department will make a recommendation for tenure/promotion or denial of such; • the department will vote; • the department decision is communicated to a university panel of individuals from outside of the department who evaluate the application and decide whether they agree or disagree with the departmental recommendation; • the dean; • the board of governors/president or other upper level governing body. A decision to reject a candidate for tenure normally requires that the individual leave the institution within two years (under the
AAUP tenure guidelines). Otherwise, tenure is granted along with promotion from assistant to associate professor. Although tenure and promotion are usually separate decisions, they are often highly correlated such that a decision to grant a promotion coincides with a decision in favor of tenure, and vice versa. Promotion to associate professor usually results in an increased administrative load and membership on committees that are restricted to tenured faculty. Some people remain at the level of associate professor throughout their careers. However, most will apply for the final promotion to full professor; the timeline for making this application is more flexible than that for assistant to associate positions and the associate professor does not normally lose his/her job if the application is rejected. As with promotion from assistant to associate professor, promotion from associate to full professor involves review at multiple levels, similar to the earlier tenure/promotion review. This includes external reviews, decisions by the department, recommendations by members of other departments, and high-ranking university officials. Usually, this final promotion requires that the individual has maintained an active research program and excellent teaching, in addition to taking a leadership role in important departmental and extra-departmental administrative tasks. Full professor is the highest rank that a professor can achieve (other than in a named position) and is seldom achieved before a person reaches their mid-40s. The rank of full professor carries additional administrative responsibilities associated with membership on committees that are restricted to full professors. Two-year community colleges that award tenure often use the "professor" ranking system as well. Candidates for tenure at those institutions would not normally need to hold a PhD, only the degree necessary (usually a master's) for employment as an instructor.
Non-tenure-track positions Individuals in these positions who typically (though not always) focus on teaching undergraduate courses do not engage in research (except in the case of "research professors"), may or may not have administrative or service roles, and sometimes are eligible for job security that is less strong than tenure. They may still be referred to casually as "professor" and be described by the common-noun "professor", whether or not they have been officially designated that position title by the university or college. Likewise, the term "instructor" is very generic and can be applied to any teacher, or it can be a specific title (tenure or tenure-track) depending upon how an institution chooses to use the term. •
Professor of (the) practice and
professor of professional practice: have commonly been reserved for practitioners who are appointed because of skills and expertise acquired in nonacademic careers and whose primary focus is teaching. This designation is bestowed on individuals who have achieved a distinguished career in a specific field of practice (engineering, management, business, law, medicine, architecture etc.), and will have a substantial basis of experience equal to a tenured professor (normally a minimum of 12 years) and a national/international reputation for excellence reflected in a record of significant accomplishments. Such appointments are also being offered to individuals with academic career backgrounds. These latter professors of practice are principally engaged in teaching and are not expected to be significantly involved in research activities. •
Collegiate professor, teaching professor, or clinical professor (with or without ranks): More recent titles with many different variations, sometimes dependent upon rank; these instructors may hold parallel ranks as their tenure-track counterparts (i.e., teaching assistant professor, teaching associate professor, and (full) teaching professor) at institutions whose policy is to only provide "tenure" to those who do research. In
professional fields where such positions typically involve a
practical or skills-based emphasis (e.g., medicine, law, engineering), they may be titled as clinical professors (in medical fields), studio professors (in architecture and design), or industry professors (in fields such as engineering and technology). In the sense of being teaching-focused and without research obligations, there are similarities to "professors of practice." •
Lecturer/Instructor: A full- or part-time position at a college or university that usually does not involve tenure or formal research obligations (although sometimes they choose to perform research) but can often involve administrative service roles. When in a regular, long-term salaried position of at least some minimal appointment level (e.g., half-time), it may include voting and other privileges. This position often involves a focus on undergraduate and/or introductory courses, sometimes as a cost-savings measure due to the lower salaries compared to tenure-track positions. In some colleges, the term Senior Lecturer is used for highly qualified or accomplished lecturers. For permanent (or at least "career") faculty members in these roles, some institutions have been converting some or all of these positions to titles such as "teaching professor" to clarify that these are in fact true faculty members. •
Research professor (with or without ranks): A position that usually carries only research duties with no obligation for teaching. Research professors often have no salary commitment from their institution, and thus must secure their salary from
external funding sources such as grants and contracts. (These are often known as "soft money" positions.) Accordingly, research professor positions usually are not eligible to be awarded tenure, but may still have ranks parallel to tenure-track counterparts (e.g.,
assistant, associate, and full levels). •
Instructional faculty (Assistant Professor of Instruction/Associate Professor of Instruction/Professor of Instruction) include professors holding part-time or full-time appointments, "who are primarily considered instructional personnel and may also have service responsibilities".
Positions typically temporary and/or part-time •
Adjunct faculty – professor/lecturer/instructional or sessional lecturer: Part-time, non-salaried faculty members who are paid for each particular class they teach. Most adjunct faculty (adjuncts) are hired as a lecturer or instructor. Originally, the title adjunct professor usually involved professionals employed elsewhere full-time, or retired professional academics, and their teaching may have had a professional practice emphasis. •
Visiting professor (with or without ranks): (a) A temporary assistant/associate/full professor position (see above), e.g., to cover the teaching load of a faculty member on sabbatical. (b) A professor on leave who is invited to serve as a member of the faculty of another college or university for a limited period of time, often an academic year. •
Student instructional positions (not "faculty" positions): Teaching assistant (TA), graduate teaching assistant (GTA), course assistant (CA),
teaching fellow (TF), instructional student assistant (ISA),
associate instructor or graduate student instructor (GSI). Positions typically held by graduate students. TAs play a supportive role involving grading, review sessions, and labs. Teaching fellows (and at some universities, TAs or GSIs) teach entire courses. In any event, these positions are notably not considered "faculty" positions, and never vote in faculty elections or serve on faculty committees, etc., even at institutions where part-time faculty may do so. Their teaching is considered part of their training as students at the university, and is generally under the supervision of a faculty member in some manner even when a faculty member is not directly involved with the course. See also: Teaching fellow#United States.
Retired faculty Retired faculty may retain formal or informal links with their university, such as library privileges or office space. At some institutions, faculty who have retired after achieving the rank of professor are given the title "professor
emeritus" (male) or "professor emerita" (female). ==Tenure-track faculty ranks==