Strategist (noun)

1. A person who is skilled in making plans for achieving a goal or overall aim.
2. A person who is skilled in devising tactics in a particular area or field.

Origin:

Late 18th century: from french stratégiste, from greek strategos "general", from stratos "army" + agein "to lead".

Examples:

1. He was considered one of the most brilliant military strategists of his time.
2. The company hired a new marketing strategist to boost sales.
3. She's a political strategist who has been involved in several successful campaigns.
4. The company's financial strategist suggested cutting costs to increase profits.
5. He's a chess strategist and has won several tournaments.