A key White House adviser on infrastructure policy is "moving on" to pursue unspecified opportunities, a White House official told the Washington Examiner.

D.J. Gribbin, special assistant to the president for infrastructure policy, joined the White House early in Trump’s administration in February 2017, but despite several pushes, President Trump’s efforts to boost infrastructure spending have stalled.

Larry Kudlow, Trump’s new top economic adviser within the White House, praised Gribbin in a statement, as did his predecessor Gary Cohn, who resigned earlier this year following Trump’s decision to impose steel and aluminum tariffs.

“D.J. was a key part of the team that turned the president’s ambitious vision for rebuilding America’s infrastructure into the policy proposal the president released in February,” Kudlow said. “His expertise has added tremendous value to the administration. We thank him for his hard work and dedication, and wish him well on his future endeavors. The NEC will continue to push the President’s infrastructure initiative as part of his pro-growth economic agenda.”

Cohn added: “Since he joined the team early last year, D.J. has played an important part in coordinating the administration-wide process behind the president’s infrastructure initiative. I am grateful for his service and fully believe that the plan President Trump delivered to Congress, combined with the work we are doing administratively, will have a transformational impact on our economy.”

Gribbin was not a well-known White House official, and his role was summarized in bullet points shared by email with reporters.

“D.J. spent the last year leading an administration-wide process formulating the president’s infrastructure initiative, which he formally released in February,” a White House official said in one bullet point. “Now that the plan has been presented and is making its way through Congress, D.J. is planning on moving on to new opportunities.”

Gribbin previously worked as chief counsel for the Federal Highway Administration, general counsel for the Department of Transportation, and as director of public sector business development at Koch Industries.