It's possible that:
* He may not be an actor: Lew Lappert could have a different profession altogether, and the name is not associated with anyone working in film or television.
* He may have a different name: He might be using a different name in the entertainment industry.
* He may be a minor actor: His work may be limited to small roles or uncredited appearances.
If you have more information about Lew Lappert, such as a specific time period or type of project, that might be helpful in finding more information.