Bromiley was not only a renowned church historian and historical theologian, he significantly influenced English-language Christianity over the past six decades, translating and editing—from several original languages—thousands upon thousands of pages of theological works from such notables as Karl Barth, Jacques Ellul, Helmut Thielicke, and others.
Among his many translations widely used by English-language readers are the 10-volumes of the Theologisches Wörterbuch des Neuetn Testaments (Theological Dictionary of the New Testament), edited by Gerhard Kittel; Wolfhart Pannenberg's three-volume Systematische Theology (Systematic Theology); and the Kommentar zum Römerbrief (Commentary on Romans) by Ernst Käsemann.
Geoffrey Bromiley, together with N. T. Torrance made an immesuarable contribution to the work of T&T Clark by his translating and editing of Karl Barth's Church Dogmatics, a work still used, loved and studied by many scholars world wide.
You can find an obituary on the Fuller website here.
Ben Myers has a piece here.
Geoffey Bromiley's translation of the Church Dogmatics has just been published in a new Study Edition. Two of his other books are still in print with T&T Clark: Historical Theology: An Introduction and Introduction to the Theology of Karl Barth.