David Krumholtz (born May 15, 1978) is an American actor best known for playing Professor Charlie Eppes in the television series Numb3rs. He appeared as Seth Goldstein in Harold & Kumar Go to White Castle and its two sequels, Harold & Kumar Escape from Guantanamo Bay and A Very Harold & Kumar 3D Christmas. He is also known for his role as Bernard the Arch-Elf in The Santa Clause and its sequel, The Santa Clause 2. Additionally, he is known for his role as "Mr. Universe" in the 2005 film Serenity. He also played Michael, the AV geek, in 10 Things I Hate About You, starring Heath Ledger.