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What's the difference between an associate professor and an assistant professor?

What can one of them do that the other can't? and which is a higher level? can any of them supervise a PhD student?

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As you can see from the answers so far, this varies by country. It would help if you would say what country you are interested in. –  Nate Eldredge Jul 21 '12 at 3:56
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D. Schrute: "assistant regional manager." M. Scott: "erm, assistant to the regional manager." –  DuckMaestro Jul 21 '12 at 8:27
    
@JoelReyesNoche I find your comment intimidating! We want to benefit from a "community" to ask community-related questions! –  Armand Feb 11 at 14:42
    
@Armand I guess that Joel Reyes Noche is saying is that this specific question would have been very easy to answer via Google / Wikipedia (hence, no community was necessary for that). –  xLeitix Feb 11 at 15:28

5 Answers 5

up vote 40 down vote accepted

In a typical university in the United States:

An assistant professor is an entry-level faculty member. They are generally on the tenure track (although the term "assistant professor" does not guarantee this) but do not have tenure yet. Typically, within about seven years an assistant professor will either be promoted to associate professor or will leave the university, although the timing can vary a little and it's theoretically possible to remain an assistant professor forever.

An associate professor is one step up from an assistant professor. This promotion is usually the same as getting tenure, but not always. (Some universities, like MIT, frequently have non-tenured associate professors.) The final step for most faculty is a full professorship.

As for what an associate professor can do that an assistant professor can't, that varies even more than the terminology. In many US universities, the only additional power an associate professor has is voting on who gets tenure, but I wouldn't claim this is universally true.

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To complicate matters further, it is possible to be an untenured associate professor (the title confers some seniority and a pay scale shift, as well as occasionally an accelerated tenure clock) –  Suresh Jul 21 '12 at 6:15
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Usually a non-tenure-track assistant professor will have a title such as "research assistant professor" to make the distinction clear. –  aeismail Jul 21 '12 at 6:58
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In some departments (like my own), only full professors can vote on tenure cases. –  JeffE Jul 21 '12 at 18:09
    
Also, assistant professors cannot be dissertation chairs wile associate professors can be. –  Amatya Mar 25 at 3:50
    
Is Canada similar? –  azer89 May 20 at 22:05

In the Netherlands both assistant and associate professors are frequently tenured (= have a permanent position). Associate professors are expected to develop their own research line, while assistant professors can work on the topics of their bosses (full professors). Neither assistant nor associate professors can formally supervise PhD students: they can only co-supervise. There are some more minor differences: e.g., associate professors can be members of the Ph.D. assessment committee, assistant - not, unless they are co-supervisors of the candidate.

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In France, the position Assistant Professor is a permanent position. As research activities are also done in labs in addition to the universities, the positions are:

  • assistant professor (maître de conférences) : permanent teaching position, but can not supervise PhD students alone.

    Is typically working towards a habilitation (HDR, habilitation à diriger des recherches), a longer-lasting standalone research project of about 5 years, during which the person co-supervised a few PhD students. After defending the project in front of the jury a person with an HDR can supervise PhD students alone.

  • professor (professeur des universités) : permanent teaching position, can supervise PhD students alone.

  • full researcher (chargé or directeur de recherche) : permanent research position without teaching, can supervise PhD students alone if holder of the HDR.

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"Assistant Professor" = "maître de conference"? I'm always confused about the French CR2, CR1, DR, Prof, MC, ... –  yo' Feb 11 at 14:20
    
Um, actually, not completely sure :) I'm doing a PhD in France, and that's how they translate-explained to me, I'm not sure of the original name. But, no, I don't think that's the same thing. –  penelope Feb 11 at 14:27
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@tohecz, "assistant professor" is indeed how they usually translate "maître de conférence". A normal professoral career is MCF, then PR2, then PR1. CR and DR is "chargé" and "directeur de recherche", they're non-teaching position. The normal researcher career is CR2, CR1, DR2, then CR1. The HDR is required to get any PR or DR position. –  scozy May 19 at 20:09
    
@scozy. Thank you for editing that in. It's great information, and I didn't really ever get around to learning the French titles. –  penelope May 20 at 16:49
    
There are a few slight errors in this answer and in the comment thread. First, I would not say that "maître de conférence" is closer to assisant professor than to associate professor (as far as the unofficial status is concerned, it depends on the field). Next, in some fields (at least in math) there is no need to co-supervise PhD student when preparing a HDR. –  Benoît Kloeckner May 20 at 20:38

In Australia, the typical hierarchy is:

  1. Associate lecturer
  2. Lecturer
  3. Senior lecturer
  4. Associate professor
  5. Professor

There is no "assistant professor". In this academic ranking system associate professor is a high ranking. I think that both associate professor and professor in Australia would correspond roughly to professor in the United States.

Supervision of a PhD student depends on university regulations. At my university in Australia, there are several requirements in order to be a principal supervisor. In particular, (a) you need to have completed your own PhD or in rare cases be of equivalent standing, (b) have been an associate supervisor of PhD student to completion, or completed a set of training and experiential activities.

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My understanding is that being a "Professor" in Australia, the UK, or New Zealand is similar to having an endowed chair in the US. –  Mark Meckes Feb 11 at 15:56
    
NOT true, there ARE assistant professors in Australia: here is an example of a research assistant professor. Their rank is in between senior lecturer and associate professor. –  Eksze Mar 24 at 12:30
    
    
    
@Eksze Fair enough; that's a change from when I was a Level B Lecturer at UQ. However, you said Their rank is in between senior lecturer and associate professor. which you just contradicted --- which is all I was trying to point out. –  Peter K. May 26 at 14:04

In the Czech Republic, and I suppose that in some other "former Eastern block" countries it's similar, there are 3 types of university permanent positions:

  • asistent -- usually translated assistant professor

  • docent -- usually translated associated professor -- you become a docent when you do your habilitation

  • profesor -- usually translated full professor -- you become a profesor when the president of the Czech Republic promotes you.

There are no other distinguished levels at the universities. However, the Academy of Sciences is completely seperated, and it's different there. Nobody is, however, called a professor there.

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The system is very similar in Croatia: not sure that the president promotes you, or if it's somebody from the University's ranks, but once you are a Professor, you are one for life. Oh, and on the contrary, I called everybody higher-up than me "profesor" when I was doing my BSc and MSc, even the assistaints when I waas unsure what to call them –  penelope Feb 11 at 14:29
    
@penelope People always used to call me "professor" even when I was only TA'ing. I think this is just students not having a lot of insight into how the academic ranks work (and, as this question shows, this is no big surprise as the system is kinda varied and unclear). –  xLeitix Feb 11 at 15:30
    
@xLeitix They don't call me that way when I teach. But (1) I'm a PhD student without a position, and (2) we "tutoyons" and not "vouvoyons", because I prefer it that way, so they call me just "Tomáši" :) –  yo' Feb 11 at 15:37
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By the way, I hope you won't be too offended that I changed "Czechia" to "the Czech Republic." I personally root for English speakers to start using "Czechia" but it isn't widely recognized (as explained in this Wikipedia article: en.wikipedia.org/wiki/Name_of_the_Czech_Republic). –  Ben Webster Mar 24 at 22:14

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