Burke seems to be a pretty involved guy for Weyland-Yutani Corp. He acts as point of contact/liaison with Ripley at Gateway Station, sends a message to the colony on LV-426 to investigate the 'Space Jockey' ship (and seems to have the potential to intercept or interfere with communications, etc between the colony and the Company) and accompanies the Colonial Marines and Ripley to the planet.
What was his actual role for Weyland-Yutani?