Lampert was a chemical company.
In the 1940s, Jay Garrick worked at Lampert, and in a chemical explosion in the lab, gained his powers.
- Young Justice #5: "What's the Story?" (flashback)
Background in other media
In the comics, Jay Garrick gained his powers in an accident in his junior year at Midwestern University, not while working for a private corporation. Lampert is named after Harry Lampert, the artist who created Jay.