G. K. Chesterton once wrote, "The Church is a house with a hundred gates; and no two men enter at exactly the same angle."
Gabriel, not knowing your father, I do not know how it might be best to introduce him to Orthodoxy. A few thoughts:
1) Be supportive of his search. Ask him, before he makes a decision, to give Orthodoxy serious consideration. Don't argue with him. Few fathers are going to listen to their sons in a matter like this.
2) I assume your father has been attending Sunday Mass. Encourage him to attend the Divine Liturgy. I hope that a convert-friendly OCA or Antiochian parish is available to him locally. God help him if the only nearby Orthodox parishes are ethnic-centered where the liturgy is celebrated in Greek or Slavonic or whatever. It takes a committed person to break through the cultural-linguistic barrier. The Divine Liturgy and the beauty of holiness is the heart of Orthodoxy.
3) Given that your father is a university president, it would certainly be appropriate for you to recommend to him a couple of books. These books need to be chosen wisely. Avoid pop-Orthodox polemics. Your Dad will see right through them. I recommend the following:
a) Alexander Schmemann, For the Life of the World.
I can't think of a better theologian to introduce one to Orthodox liturgical theology and the spirit of Orthodoxy worship than Schmemann.
b) Kallistos Ware, The Orthodox Way.
In my opinion, this is a thoughtful, well-written, and accessible introduction to Orthodoxy.
c) John Anthony McGuckin, The Orthodox Church
This is a big, serious book. It certainly is not the first book I would put into an inquirer's hands, but if your father begins to show strong interest in Orthodoxy, this is definitely a book to consider pointing him toward.
d) St Nicholas Cabasilas, The Life in Christ
An Eastern Orthodox classic and the best introduction to the Byzantine understanding of theosis that I know.
Others have mentioned history as a way into Orthodoxy. Clearly history can be one of the gates of which Chesterton speaks; but I have to disagree with those who think that the testimony of history clearly and obviously points to the Orthodox Church as the exclusive successor of the apostolic Church. John Henry Newman knew his history and patristics far better than any of us, and he became convinced that history pointed to the Catholic Church as the Church. There are plenty of folks who have made similar judgments. As the physicists have taught us, there is no uninterpreted data. But perhaps your Dad is interested in Church history. The Chadwick title, already cited in this thread, might be a good place to begin.