He was the authority

Tom is an excellent go-to person. He is extremely knowledgeable and helpful and is able to understand the business context of problems as well as the deep technical details. I found him very easy to work with and always willing to go beyond the bare requirements of his job. Whenever someone wanted to do anything with firewalls in the corporation, I would always refer them to Tom because he was the authority on what was currently there and what could be there if needed.