This Disney Imagineer wrote the words to "Grim Grinning Ghosts". This song is played in Walt Disneyland's and Disney World's "Hanted Mansion" attractions as well as Disney's "A Spooky Night in Disney's Haunted Mansion" album. The song is performed by Thurl Ravenscroft.
Provided the voice for the breakdown and unload spiels at both the Disneyland and Walt Disney World Haunted Mansion rides (Atencio was also the writer of both shows, as well as the lyricist for the ride's main song 'Grim Grinning Ghosts').