Looking for Mid-Century Modern Sensitive Landscape Designers

Greetings,

My husband and I just purchased a  mid-century modern home in Wallingford, PA, and are looking for someone to help us create a landscape that compliments the house.  It is a large yard with many mature trees and is in need of a lot of work, including:  perimeter plantings to screen the house from the busy street, grading, patio redesign, removal of some trees, removal of an old fence, etc.

Any recommendations would be greatly appreciated.  In addition to designers, books and helpful website recommendations would be great!