Who is Dr. Zollner from Plum Island and what is their importance?

Dr. Zollner is the Director of the Plum Island Research Facility, and gives the team their tour of the research station. Dr. Zollner is a fat man with a German accent, who wears glasses and has a Vandyke beard. He reminds John of Burl Ives. This character represents the powerful and enigmatic government.