The Exchequer is in charge of the money raised by the
group, including the money people pay to attend events and money donated to the group. She is responsible for handling the group's expenses (such as paying for event sites).
Arts and Sciences are just what they sound like. The line
between what is an "art" and what is a "science" is often blurred, hence one
person organizes workshops in both areas, and helps people find others to
help them in specific areas of interest.
The Castellan is the person who helps newcomers. If you
are newly joining the SCA, or just visiting an event because the pavilions
caught your eye as you drove past, this is the person who will answer your
questions. And if he can't, he'll help you find someone who can. She also is
the person to contact if you would like our group to put on a demonstration
for your school or event.