Yes, it is a lengthy book with lots of commentary from Jan's personal and professional associates (and family), including Dean.
It is very much Jan-centric . . . but it's important to remember that Dean is writing his own memoirs, so that's something we can all look forward to in the near future.
The way it worked out, it's really a combination of biography and reference, which renders my earlier stated intentions for separate projects inaccurate.
In other words, it will be titled and marketed as a reference work, but you'll still get the biographical information.