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In a review of Washington D.C.-based lobbyists The Hill wrote, "A former Senate Budget Committee staffer and Pentagon appointee, Helm has his hands full overseeing Northrop’s interests."
- Sheryl Fred, "The Best Defense - A Guide to the Interests Driving the FY2004 Defense Budget", Open Secrets, October 1, 2003.
- "Best in the Business", The Hill, April 24, 2007.
- Ken Silverstein, "Send Lawyers, Guns and Money: Lobbying and the Merchants of Death", Common Courage Press, 1998.