wrangler

noun

• 1North American a person in charge of horses or other livestock on a ranch.
• a person who trains and takes care of animals on a film set: they had three cow wranglers to help with the scene

• 2a person engaging in a lengthy and complicated dispute: he was known as the wrangler for the aplomb with which he skewered the professors

• 3(at Cambridge University) a person placed in the first class of the mathematical tripos.