Hello
We may be able to with a little more information and a picture close up ( taken from one or two feet away)of a branch showing several buds  and leaves on the branch.

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Click the “Drop files here or choose them” below the response box to attach them.

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Have you ever noticed any flowers on the  tree,
- if so what color are they and about what time of year do they bloom?
Do you see any fruits, nuts or seeds on the tree? 
From the pictures you have given the leaves have anthracnose. That is a fungal disease that particularly happens in years with a lot of rainy weather. Nothing can be done for anthracnose now. It is treated in early spring with fungicides sprayed all over the tree in early spring as buds begin to open.

Rake up as many fallen leaves as you can this fall to minimize the fungus carrying over next year. If we get a droughty time this summer or fall, slowly water the tree root zone to keep soil moist but not soggy. Keeping the tree watered during drought helps it to recover for next year.

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You are welcome.
Here is a bulletin for you.
http://plantclinic.cornell.edu/factsheets/anthracnoseoftrees.pdf