>! It's [Mithrandir][1] 

His head sounds like a myth, with an eye for why <br>
Endless, it says to meet but briefly so, <br>
standing for the very famous MA institute. <br>

>! Mith is the head, sounds like Myth also i -> y <br>
>! MA Institute -> MIT, front of *Mit*hrandir

Then comes the first name of another puzzler, we all are very familiar with <br>
named after the prime of a time wheel with <br>
a horse god at his feet, whose kind really starts six places later. <br>

>!

At last, anger or annoy without end— <br>
its birth is half the death, where the dawn is equally four sided of <br>
any trio’s total member number. <br>

>! 

Bonus:
 >! There was a [dispute][2] about you posting their rhyme.


  [1]: https://literature.stackexchange.com/users/58/mithrandir
  [2]: https://puzzling.stackexchange.com/questions/53992/babys-drink-mathematicians-think