A "thinker" is a person who enjoys using their mind to ponder, consider, and form opinions or insights about different topics or situations. Full definition
Communication skills reach new levels and we see students emerge into critical thinkers of a whole new level. (springhillschool.org)
While business owners are known for their optimism, they're also known as creative thinkers who see opportunity where others don't. (insureon.com)
This is a question which has engaged the interest and attention of thinkers in all ages; and the answers which have been given to the question have been many and various. (religion-online.org)