Between 2015 and 2018, Ambassador Herbst, Dr. Wolterstorff, and former Congressman Flanagan presented four times on the situation in Syria to the staff of the United States Congress House Foreign Affairs Subcommittee on the Middle East and North Africa.
The Atlantic Council's Syria Source blog:
Finding Ground Truth in Syria: Bringing Light to a Confused Information Environment
Wolterstorff, Eric. "INCA: Creating an opportunity for Shared Responsibility." US Army War College, Peacekeeping and Stability Operations Journal, Volume 6, Issue 1, September 2015, pp. 12-13.