From Bulbapedia, the community-driven Pokémon encyclopedia.
Spencer Hale (Japanese: シュリー・スノードン Sully Snowdon) is a researcher from the town of Greenfield. He lives in a huge mansion with his unnamed wife and his daughter Molly. His Japanese voice is 竹中直人 Naoto Takenaka, and his English voice is Dan Green.
His wife left him, but in the dub this was changed to her disappearing when looking for the Unown, a project he was a part of as well. One day, as he explored an ancient building with his assistant Skyler, he too vanished into the dimension of the mysterious creatures. His daughter was sad because he didn't return, so the Unown created an illusionary Entei to be her father.
He returned later, as did his wife, after the Unown's influence over Molly ended.
Spencer is good friends with Delia Ketchum, and they were both students of Professor Oak.