I am not an Academic in any sense. I am a lay member of the United Methodist Church. I stumbled across this book due to the excellent search tools provided by Logos. I was most interested in the material related too the title, specifically, the influence of the Jesus's brothers on the early church. I stumbled across the discussion of Clopas in the NT which had been discussed in a Bible study I attend. I found his treatment of these topics to be well expressed and well thought through. I cannot judge the quality of his scholarly work but I suspect it is also very good. Slightly challenging for a lay person I still found the material useful and not overwhelming. He did not overwhelm me with Greek but used it so to benefit scholars and laity. Expect to find involved analysis and proofs that involve multiple steps. He also works on several proofs simultaneously when the evidence bares on several points.