I read Fred Kaplan's John Quincy Adams: American Visionary and greatly enjoyed it. It's very well written, and my main minor quibble is that he veers too often toward finding lessons for the present day. At the very end, Kaplan admits what is obvious after reading the book:
The opposition that he met, his successes, and his failures are part of the torn fabric of public discourse in early-twenty-first century America (p. 583).
This goes a bit far, especially since the book clearly sees him as a victim in this torn fabric. If anything, we see that U.S. politics have forever been characterized by nastiness so were torn from birth. What we also see is a man who dished it out as well as he took it. He was highly--even amazingly--moral but also incredibly uptight and prone to being thin-skinned. He was very introspective, writing voluminously in his diary (which constitutes the core source for the book) and he spent a lot of time thinking about how to dish it out (e.g. we learn about how much he detested Thomas Jefferson). Even if we agree with his causes, such as abolition, we should not see him as a victim.
Kaplan wants to show JQA as a writer and as a visionary for what the United States should become, particularly in terms of a unified country without slavery. In this he does an excellent job. JQA was widely read and even wrote poetry that was occasionally published. He was eloquent and loved public speaking, sometimes for several hours at a time.
It's hard to imagine someone with more lifelong dedication to public service. John Adams brought him abroad at a young age and he learned multiple languages that soon would serve him in diplomatic posts. Kaplan shows how these positions were often tedious--early 19th century Russia was not a place you wanted to be during winter. But JQA was there for several years. He later served as Secretary of State, President, and then was elected to the House of Representatives. Perhaps appropriately, he literally died in the House.
I also had not realized there was a photograph of him. He does not look like a guy to be messed with.