point person

noun2

1. •
   One who goes ahead of a group in order to indicate the direction in which it should move.

   • Once he is sure the point person is on the bearing the reference person can move up to the position of the point person and the point person can continue on the bearing. — 1997
2. •
   The person in the most prominent position on something, such as a spokesperson or manager.

   • The ideal bridge between the company and the production vendor's team is the point person (project manager, contact person, lead person, or liaison) and at least one backup point person. — 2017