Do not expect an immediate response to e-mail questions. Except in
emergences,
I will generally respond to (suitable) e-mail questions only once per week
(at the weekend).
I cannot (& will not) respond to e-mail questions about specific homework
problems etc. See the
Questions & Feedback page for details of how & where to ask such
questions.
I spend a substantial fraction of my time
working at the NASA Goddard Space Flight Center in Greenbelt.
If you need to see me for
some personal reason outside Office Hours, then it
is essential you send me
e-mail at least 2 days in advance.