Yeah, yeah, I know.
Ask the question in the title of this post and there are many contenders and no obvious Barth/Luther/Calvin/Augustine/Aquinas standout.
The contenders include: Hooker, Jewel, Ryle, Maurice, ++Ramsey, Sykes, Macquarrie, ++Williams. [Some might cheekily pop John Wesley or Cardinal Newman on the list :)].
The last name on my list would probably get the nod in a popular vote because very, very well known around Anglicanland as greatest ever theological ABC, etc.
But there is another name to consider, the late John Webster, and some reasons why are given in this obituary written by Kevin J. Vanhoozer (H/T Bryden Black).
Here is a sample paragraph, deliberately chosen because it mentions a "hot topic" here at ADU ...
"Like John, I too was searching for a way out of the desert of criticism–a way out of the methodological morass of modernity and into the Promised Land of dogmatics and doxology, where I could use language to speak well of, and praise, God. In particular, I came across John’s essay on “The Dogmatic Location of the Canon” (reprinted in Word and Church), in which he re-established the canon, and sola scriptura, in its magisterial place over the church, in contrast to postliberals who were in danger of collapsing Scripture into the tradition of its ecclesial use. I admired the boldness of the essay, its clear argumentation, and its thoroughly theological approach."
See also this excerpt from an article by Ivor Davidson (whole article behind paywall).