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How to judge a Professors quality while choosing a PhD?

I have completed my Masters in Pure Mathematics. I want to work in fields which involve Algebra,Functional Analysis,Complex Variables.

I also have my own funding to pursue my Research.I have qualified an exam which will fund my studies for 4 years.

But I have the following questions:

  • Most of the questions asked here for example How to judge the reputation of a potential advisor or research group for good quality research for PhD? asks to visit the labs. In Mathematics we dont have any labs.
  • I searched some Professors working in the areas I have mentioned. Some of the Professors had great citations in the period 2005-2010 but now they dont get enough citations hardly 1 or 2.
  • Also should I try to join a reputed University as I beleive all Professors will have great publications there? Or should I not judge a Professor on where he/she teaches?
  • Also it is not possible to visit every Professor personally

In other words I am confused. I dont understand what to see and what not.

Can you kindly say how should I judge a Professor or what are the factors to be taken into account ?

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Disclaimer: My answer rather aims at underlining that judging which Professor is the best for you depends on your long-term objectives.

You might want to choose your supervisor for two reasons. They sometimes do not align (i.e., it's either-or).

  • Choosing a Professor for during the PhD: You might want to choose a good supervisor for the time you are PhD student. In such case, you are looking for someone who has already supervised PhD, has time, has research focuses aligning with your research topic/motivations, etc. This will ensure you have a "nice time" during your PhD, with enough support and guidance. Talking with former PhD students might help. Note that in this case, the institution (in terms of courses, funding, support, etc.) matters too.
  • Choosing a Professor for after the PhD: However, sometimes, what you focus on is the next step. It may vary from one field to the other (I don't know about math at all), but I know first-hand that sometimes, what matter the most for getting the position is recommendation letters (more precisely, who wrote them). Having the right (meaning "well established and acknowledged, with large network) connexions helps you getting visiting PhD/PostDoc positions more easily. Don't get me wrong: you won't get those positions if you are not doing good research. However, when you have reached a certain "enough good" level (except in some rare case where you're extraordinarily brilliant), my opinion is that the quality of your work matters less than who recommends you — for junior researcher position, at least. So in such case, working with a Professor that has an above-average impact factor, published in renowned journals, and, most importantly, have "sent" PhD students in prestigious institutions (what they — the Professor — can easily do because their best buddy is PI there) and "landed" former students in cool positions is what you are looking for. Even if they might be less good mentors during the PhD. So track where are currently working their former students.

In both cases, look for a Professor that is interested in what you are doing.

Remember also that it's just like houses or spouses: there is no such thing as a ideal positions. You want to find the best "good-enough PI" that would accept you, even if they are not perfect in some aspects.

Finally, please consider that you are choosing a position that will significantly impact your life for the next 3–6 years. Don't neglect your personal needs/requirements (a very good position is not worth anything — in my opinion).

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  1. Go off their paper importance. And then your impression of them, based on conversation if possible, or popular writings. In addition to their math skill, you will need someone that is a good advisor. In particular ask previous or current students about the reputation for getting people done quickly (or at least not the converse) and for getting people into good jobs. And for personal relations.

  2. I think this might be a little less important in math than in the sciences. You're going to discover your own theorems regardless. It's not like you need an active lab group. As long as the fellow still has prestige in his field you should be fine. Also often older advisors are kinder.

  3. Going to a good university is key. You need to include it in the calculus. People will consider where you were able to get into. You still need a good advisor too--don't go with a jerk or a weak one at a name school. But I advise against going with a big fish in a small pond. In addition, peers will be better at the name school. Also likely it is in a bigger town (more fun). You also have better fallback options for other advisors. More people come to talk there. You might even collaborate with other professors. The undergrads are smarter. It's just better all around.

  4. Be selective. Even if you miss some you still learn just from going through the process (what you care about, what are factors, etc.) If there is a key, key one, reach out by telephone or email or mail. Obviously let the person know that he is a key one, not just you trying to talk to all, so he gives you the time.

Caveat: I am not a mathematician.

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