If you don't know the work of Carlos Kleiber, here's a fascinating documentary about him: Carlos Kleiber--Traces to Nowhere. You may want to see and hear further examples of his work as conductor after watching it! You can find a number of them on YouTube and some are on DVD: here, here, and here, for example.
His father, Erich Kleiber, was a well-known conductor who led the premiere of Berg's Wozzek.
Best to watch on YouTube itself, not on these smaller videos--and it's high enough resolution to watch full screen on most computers (and see if you know what music ends the video!).
Richard Sparks is a conductor.
He's Professor of Music at the University of North Texas, where he conducts the University Singers and Collegium Singers, and is also Chair of the Division of Conducting and Ensembles.
From 1999-2011 he was Artistic Director and Conductor of Pro Coro Canada in Edmonton, Alberta--a professional chamber choir; and a free-lance conductor/clinician working in the US, Canada, and Europe. He spent considerable time working with the Swedish Radio Choir in 2007 and 2008.
He's Conductor Emeritus of Choral Arts in Seattle, WA (which he founded and conducted from 1993-2006) and was Director of Choral Activities at Pacific Lutheran University from 1983-2001.
