OMH! I never thought he would be on the Internet! He has posted a number of his articles on his website. It’s a very valuable resource, go check it out.
Also, a festschrift has been published in honor of his retirement. Here’s a link to the table of contents and introduction.
I’m so thankful I was able to take Introduction to Systematic Theology and Acts and Paul with him before he retired. He really is a brilliant theologian and teacher. He will be missed at Westminster.