He was acquired as a free agent by the Rangers in July, 1999. At 5 foot 6 inches tall, he has become a role model for hockey players under 6 feet tall (6 feet considered to be the standard size for the NHL).
Theo is known for his fiestiness on the ice, and his determination. Diagnosed with Crohn's Disease in 1996, he has been determined not to let the disease rule his life.
Unfortunately, on April 11, 2003, Theo was suspended indefinitely by NHL for violating the terms of his substance abuse aftercare program. He played the 2005-06 season with the Belfast Giants of the British Elite Ice Hockey League, and was named 2006 Kingdom of the Giants Most Valuable Player, but decided not return for the 2006-07 season.

