Van D. Costas, Inc. (Costas) entered into a contract to remodel the entrance of the Magic Moment Restaurant owned by Seascape Restaurants, Inc. Rosenberg, part owner and president of Seascape, signed the contract on a line under which was typed ‘‘Jeff Rosenberg, The Magic Moment.''

When a dispute arose over the performance and payment of the contract, Costas brought suit against Rosenberg for breach of contract. Rosenberg contended that he had no personal liability for the contract and that only Seascape, the owner of the restaurant, was liable.

Costas claimed that Rosenberg signed for an undisclosed principal and, therefore, was individually liable. Explain whether Rosenberg is liable on the contract.