maybe I'm wrong while both you and traitorfish are right, I can't have so much confidence in this issue but for sure there are several interpretation of who is Iskandar Zulkarnaen are, whom been related as a wise King and been mention and praise in Quran.
Many peoples see the criteria are closer more likely to Cyrus than Alexander the Great. I'm not a shiite but I do once had try to enter the Iranian shiite community from my languages course just for curiosity, while talking about history they never have a rest on joking or cursing Alexander, and they percept Iskandar as Cyrus not Alexander.
And regarding the shiite in Iran you must know the more religious they are they more nationalist they are, the raising of Shah Ismail in the time of Yavuz Sultan Selim is not only the raising of Shiite against Sunni but more into the raising of Iran Nationalism, and so the Shiite today are more into Iran nationalism than actually a religion. The base doctrine of shiite is on hating historical character, name it : Abu Baqr Shidq, Umar Ibn Khatab, Umayyah Ibn Abi Sufyan, Yazid Ibn Umayyah, Abu Hurairah, etc.
Not to mention Alexander whom they consider doing rampage to whole of persepolis, even the first caliph whom introduce them with Islam they not give him a respite. So I really hardly believe the persian consider Alexander as Iskandar, if they do consider there is no room for them to condemn him because regarding to Islamic doctrine Iskandar is an awliya or a person who close to God. You may ask this to your professor maybe I'm the one who wrong here.
Btw, in west sumatera, specifically in Bukit Tinggi, they consider themselves to be descendent of Alexander the Great. You can examine it from their tambo or oral tradition, they name him Maharajo Dirajo. They state the youngest son of Alexander decide to cross the pillar of hercule from India to seek for the lost continent, so they sail and end up in Bukit Tinggi, where he teach the local to form a government base on 10 peoples that coming from 3 different group of peoples which they called as Tigo Tungku Sajarang, one group is delegation of intellectual, another group religious, another group ninik mamak or leader of the community. And this system stand for quite long until the era of Pagaruyung Kingdom I suppose.