pre·side 
(prĭ-zīd)
(prĭ-zīd)intr.v. pre·sid·ed, pre·sid·ing, pre·sides
1. To hold the position of authority; act as chairperson or president: presided over the department for a year.
2. To possess or exercise authority or control: preside at a meeting.
3. Music To be the featured instrumental performer: presided at the keyboard.
[French présider, from Old French, from Latin praesidēre : prae-, pre- + sedēre, to sit; see sed- in the Appendix of Indo-European roots.]
pre·sider n.