Jess Day is one of the pre-made townies in La Fiesta Tech from The Sims 2: University. He can be made playable by befriending and asking him to move in, or by marrying him. Jess has the same facial structure as Seth Hourvitz.
Jess' name is randomized when La Fiesta Tech is generated. The name "Jess Day" is only referenced in the game files. He is also one of the 15 pre-made members of the LFT secret society.