IDK why he/she will be in drugs for simple question as this one. Nonetheless, to your query YES! boston C group, m'kinsey, bain do hire phd eng kids. However, they all do that in-school recruitment. IDK why you would ask this question in this forum instead of your CS in school. hmmmmmm. Obvioulsy recruiting is def hard because these are your top 3 consulting groups and amount of ass kissing you have to do, if you are going through cold call, through friends, is pretty crazy. Your best bet is to call your school and see if those companies recruit at your school. If they dont than start calling your professors, idk, you aunt, who ever, or even cold call. You can apply through their website but idk how much exposure you will get, since they mostly hire MBAs and like i said MOSTLY recruit from colleges.

to your last question, there is one person, Nepali, who gradute from HBS, and i think he is a senior --- at BCG. But, i think is pass 45 year of age. not that this matter.

Also, please stop trotting around about how you have phd from top 10. this is not gonna take you very far. last think you want when you looking for consulting job to brag your resume. these companies got people, who are wicked smart that they will blow you mind. So humble.  I personally know peole who have phd from MIT, C mellon, michigan and they were not taken pass their final rounds of interview at bain. just a thought. GL.

You should try looking into mid tier consulting group.