Terry Halliday is a leading scholar on the sociology of law. In 2011 he gave a very challenging talk Engaging the University at the World Congress of the International Fellowship of Evangelical Students (IFES).
He compares three different models for engagement of Christians with the university.
Pietistic vs. Apologetic vs. Dialogic.
This is probably the most inspirational talk I have heard over the last few years.
[Aside: I first met Terry 25 years ago when he taught a sunday school class at First Presbyterian Church in Evanston, Illinois, which I attended for 18 months.]
There is also a great series of very short videos where Terry is interviewed by Mark Labberton, the incoming President of Fuller Seminary.
A Dialogic Approach
Integrating Work and Christian Faith
The Courage to Face Intractable Issues
Where Faith and Political Action Meet
Christian Faith and Human Rights
How Can Locals Acquire Global Perspective?
Pitfalls and Pietism in America and Abroad
The Wisdom That Comes from the Church Universal
Living as a Christian in the Public Sphere