One hostage, Tom Fox, was killed, and the remaining three freed in a military operation on March 23, 2006.
All three were shown alert and apparently well; Tom Fox was not shown.
He will replace Tom Fox, who has led the conservancy since it was created in 1992.
An American abducted with them, Tom Fox, did not appear on the tape.
He contacted Tom Fox, a friend who was an environmentalist and former client.
"What we did was go back to the drawing board," said Tom Fox, a foundation board member.
I went to pick up a woman the other day," Tom Fox, a driver, said, "and she wouldn't get in.
"Things are beginning to happen," said Tom Fox, president of the conservancy.
To hear Tom Fox talk about the possibilities for commercial or retail development - it's on the surface.
Tom Fox was killed on March 9, two weeks before the release of other men.