Generations like to name their greatest influences, whether it is in art, science, or theology. Typically it takes a while to evaluate this, because fame does not equal influence, nor does influence equal influence, in the sense that someone who is very widely read at the time does not always translate to subsequent generations, whereas someone mostly ignored in their lifetime later rises to prominence.
A colleague was recently asked by an older pastor and lectionary study group participant to name the theologians that were most influential with us "younger" clergy. This particular pastor name Joseph Sittler and Paul Tillich, among others. For this exercise, I set a limit. I had 15 minutes to write down as many names as possible. They had to be living theologians, preferably alive and still writing. I had to have read at least a few books by anyone I mention, and I had to have had significant conversations about their work with pastors or fellow theologians.
I tried to break them down into lists (theologians like Sittler, theologians like Tillich), and they needed to be theologians I value reading right now, and I believe have a fighting chance of being theologians that endure.
This is certainly not a comprehensive list. It's enigmatic and unique to me as a reader. But I think it's helpful at illustrating what a profound and transformative generation of theologians we inhabit.
Theologians like Sittler (confessional, ecological, or both):
Wendell Berry (not exactly a theologian, but worthy of this list)
Rosemary Radford Ruether
Theologians/authors like Paul Tillich:
James William McClendon Jr.
Douglass John Hall
Colin Gunton (I know, he died, but too soon, so I include him)
Francis X. Clooney
Other theologians that will have an enduring influence (I think):
David Bentley Hart