Filmography highlights:
Happy Days
Mork and Mindy
Overboard
Beaches
Pretty Woman
The Princess Diaries
Raising Helen
Georgia Rule
Valentine's Day
New Year's Eve
Mother's Day
I may not have seen a lot of Marshall's work, but he directed a lot of excellent and influential classics. He was able to connect with both an adult audience and a young audience through his works which ranged from Pretty Woman to The Princess Diaries.
Image credit: http://www.emmytvlegends.org/files/marshallgar-1.jpg