I haven’t gotten a response to my question.  It’s been over a week.

Hello, based on your pictures and description of the symptoms the tree is exhibiting, it could be a fungus, either anthracnose or leaf wilt. Please refer to the following link for more details - https://extension.illinois.edu/sites/default/files/plant-clinic-report-oak.pdf

Anthracnose is known as leaf spot or leaf blight disease and is caused by a fungus. Typical symptoms appear as papery brown spots on leaves, often associated with the leaf veins. These spots can join together, causing large areas of browning on the leaves. The leaves appear as if they have been scorched. With time, diseased leaves may curl and drop from the tree.

Leaf wilt is a very serious disease of oak trees caused by a fungus unrelated to the anthracnose fungi. Oak wilt can result in death of trees. The oak wilt fungus invades the water-conducting tubes of oak trees, eventually causing leaves to wilt and die. All oaks are susceptible to the disease, but oaks in the red oak group are more susceptible than oaks in the white oak group.  Make sure to rake and remove fallen leaves as it can be helpful in reducing the fungi disease.

In any case, it would be best to have a certified arborist look at your tree. Hiring a trained arborist will provide proper long-term tree care with healthier tree results. Since I am not sure where you are located, I’m including a link to the following website to assist you in finding a certified arborist. Most arborists will come to your home for a free consultation but please make sure to ask this when initially contacting them.  https://www.treesaregood.org/findanarborist/findanarborist

I hope this information is of some help. Should you need any further questions answered, please let us know.