As an excuse to bring this thread back to folks' attention (for those who haven't read his great little book), I was idly trying to find something on the net about Petzold. Very little showed up but, I suspect, the two links provide a photo of the chap if anybody be interested. I can't be sure but it appears to be a reasonable conclusion.
Bittersweet experience to crew your carrier's last flight ...
From the GDR into the world: 30 years ago, Interflug landed forever - Teller Report
Bing