He held the rank of Lieutenant Commander and was the Chief Engineer of the USS Enterprise-D and USS Enterprise-E, both under Captain Jean-Luc Picard.
La Forge: It's hopeless, there is nothing we can do.
Picard: Are you absolutely sure, Mr. La Forge?
La Forge: Wait a minute..! If we reconfigure ... sub processor ... conduit ... realign ... convert ... main deflector dish!
Picard: How long?
La Forge: A couple of hours.
Picard: Make it so!