Mondrian's earliest works are heavily influenced by Impressionism and Symbolism. Examples are 'Blue Rose' and 'Red Trees'. However Mondrian moved on and developed his own movement The Style, as seen in 'Composition 10', 'Composition with Red, Yellow and Blue' and 'Broadway Boogie Woogie'. More Piet Mondrian Paintings...
Quote
"The emotion of beauty is always obscured by the appearance of the object. Therefore the object must be eliminated from the picture." More Piet Mondrian quotes...
Interesting
The Style didn't limit itself to visual art. It was also used by modern architects or for designing furniture.
Mondrian's abstract 'Composition 10' also made a guest appearance in the movie 'The da Vinci Code'.