Email Record: MacGillivray Freeman's Grand Canyon adventure : river at risk / a Great Adventure film ; produced by MacGillivray Freeman Films Educational Foundation in association with Reynders, McVeigh Capital Management and Museum Film Network ; produced by Greg MacGillivray, Mark Krenzien, Shaun MacGillivray ; written by Jack Stephens and Stephen Judson ; produced and directed by Greg MacGillivray.