Recently, a coworker and I who were hired at the same time were reminiscing about our interviews. During this, my coworker mentioned that during his interview*, he asked to see the resumes of the people interviewing him (one being our now boss and the other a senior developer).
I was shocked. I felt like such an action can put the interviewer on the defensive, and may be taken as a sort of challenge to their authority. On the other hand, I can understand why a person looking for a job would want to know the qualifications of the people they will be working with/under (though I believe that it isn't unlikely that knowing their past experience is relevant beyond the information they'd likely already share during the interview).
I mentioned these concerns to him, and he brushed them off, citing the fact that he's been offered a job at every place he's interviewed at and has used this tactic at all of them**.
My question: is it appropriate to ask for an interviewer's resume during (or before/after) an interview?
* While he mentioned asking during an interview, I'd like to also consider the idea of asking a time prior to or following the interview. This would bypass any issue with the interviewer not having an updated resume on hand.
** It is likely important to note that both my coworker and I are in our early twenties and co-oping with our company while being college students, so we don't have the most extensive experience. Still, the jobs we have applied to and held for the last ~2 years have been "traditional" 9-5 office jobs as equals to our other developers.
Edit: as mentioned by Kate Gregory, this question is asked with the assumption that the interviewer will be directly working in the same department as you where their background is relevant (such as a project lead or senior), and specifically about asking for resumes.