He is 5' 7" (1.70 m).
He appeared with Prison Break co-star Robert Knepper in the movie Hostage. They haven't made scenes together on the TV show.
He has a brother named David.
Marshall studied acting at Playhouse West in Los Angeles.
In 2003 he appeared in Malcom in the Middle as Dylan.
Marshall married Jamie Brown in June 2006, in Austin, Texas.
He likes to watch martial arts
He likes to eat pan pizzas
He would like to do sky diving .
He likes to eat tuna fish.
For some time he was considering to do modeling.
He likes to play mini golf
He likes to sleep a lot.
He likes blonde girls.
He likes to play racing games on playstation.
He likes to eat a lot of snacks
His lucky number is 7.
He drinks about 3 bottles of energy drinks a day.
Marshall actively supports programs that provide art and music education to young people.
He knows how to read and write in Spanish.
He likes to play baseball.
He likes to read comics.
He likes to ride bikes.
His favorite cartoon is The Simpsons.
As of 2006, he is learning Spanish.
He likes Italian food.
He doesn't like tatoos.
He always wanted to go to Yale.
He collects model submarines and watches
He likes surfing on the web.
His friends used to call him T.J.
He really likes electronic gadgets.
At the age of 7 he broke his leg.
One of his dreams was that of becoming a doctor.
He enjoys spending time with children.
He also studies guitar and piano, writes poetry, and is finishing a screenplay. (from the The Osbrink Agency)