Is it OK to only invite one of three co-authors of a previous joint paper to do another joint paper? I have co-authored one paper with Professor A, PhD student B and PhD student C. B left the best impression on me as the most friendly, productive and hard-working. Now, I want to do a joint paper again. Same as last time, the subject is not in A's area of expertise (nor B's or C's), though it's highly related, but I am hesitant to work with A as he tends to rush and push to publication before getting the paper to perfect (or very near perfect), and he is usually busy so I doubt that he will spend much time on it anyways. C is OK, but probably can't contribute much to the paper. Besides, I think two authors may suffice and be optimal.

Now, A is B's adviser (maybe C's too) and was my undergraduate mentor. I don't want to induce any hard feelings to A and C if they find out they, but not B, are left out of this joint venture. In the end, I did present my draft to A and gave glimpse of it in a presentation where A, B and C were present. Another reason why I choose to work with B who is a PhD student is (this may sound silly) because I think this will actually help her career, as opposed to working with a professor or working alone, as I don't intend to pursue an academic career and am just doing this for fun. Plus, the second author can act as a serious peer reviewer, so this will benefit my paper as well.

How should I do about this?
It is absolutely fine to not work with A and C as long as


all the work and ideas in your paper are yours (and B's).
your preferences on who to work with are based on academic and research skills, Making decisions based on their race, gender, ethnicity, nationality, etc. is discriminatory and hence unacceptable.


I feel it is dishonest to add A and C to the list of authors in your paper just to keep them happy.