The symptoms on the oak trees may be due to anthracnose. Anthracnose is a common fungal disease of shade trees in Iowa. Fortunately, anthracnose does not cause serious harm to healthy, well established trees. Control efforts are unnecessary

Additional information on anthracnose can be found at the following website. 

https://store.extension.iastate.edu/Product/pm1280-pdf

I have just been online to investigate a little further. These are newly opened leaves that have been affected... if you will notice the tips of most are rolled, as if housing a caterpillar... These leaves don't seem to have the same appearance as brown "scorched" marks on full-sized leaves. Other trees' leaves are fully developed and formed. Note the three photos attached. I was wondering about either the Oak leaftier and the Oak leafroller? Thank you for your help!

If the damage to the oak leaves is not due to anthracnose, it's probably oak tatters. The exact cause of oak tatters is unknown.   Information on oak tatters can be found at the following websites. 

http://hort.uwex.edu/articles/tatters
http://www.na.fs.fed.us/spfo/pubs/pest_al/oaktatters/oaktatters.htm

The damage to the oak leaves is not due to the oak leafroller or similar insects.