<p>a professor at columbia is going to mentor me this year, columbia doesnt want any extra recs, but should i still send in one?</p>
<p>What does "mentor me" mean? Are you doing research in his laboratory or something of that sort? If he has something insightful to say about you that will actually help your chances, he should communicate directly with the admissions office. Another generic rec will annoy them.</p>
<p>not for science, another project, and i think he can write a good rec about my most dedicated ec</p>