It's hard to believe, but there are some things more important than volunteer work! Seriously, if you're in a situation where there's no option but to step down, the best thing you can do is make sure someone is available to step up and when someone does step up, that everything is in order so that person can hit the ground running. Gather all your records and notes into a binder. Sit down with the new person to answer questions and explain where projects stand. And make sure your committee chairs have everything under control before you go so that they can continue their work with as little interruption as possible. Don't feel bad--sometimes life intervenes in our plans. Once you settle into your new job, you can look for ways to help out that fit with your new schedule. Congratulations on the new job, and good luck!