Conversation so far:
What type of visual effects were used in Forrest Gump?
Using CGI techniques, it was possible to depict Gump meeting deceased personages and shaking their hands
What other techniques were used besides CGI in Forrest Gump?
To record the voices of the historical figures, voice actors were filmed and special effects were used to alter lip-syncing for the new dialogue

Question: Who was in charge of the visual effects?
Self-contained rewrite: Who was in charge of the visual effects of Forrest Gump?