His writings were influenced by earlier Greek and Roman thinkers , including Plato , Aristotle , and the Stoics .
Although the main focus of his work was on medicine , anatomy , and physiology , Galen also wrote about logic and philosophy .
Galen 's writings were influenced by earlier Greek and Roman thinkers , including Plato , Aristotle , and the Stoics .
Although the main focus of his work was on medicine , anatomy , and physiology , Galen also wrote about logic and philosophy .