Grossman is stepping down as US special envoy for Pakistan and Afghanistan on December 14, after serving for about two years in the position.

"I wish him the very best and know he will continue to be a friend of Pakistan whatever field of endeavour he chooses to pursue," Ambassador Rehman said.

The Pakistani ambassador noted that as Special Representative for Afghanistan and Pakistan, Grossman and his colleagues worked untiringly with her colleagues and her, particularly when the bilateral ties were at their lowest ebb.

"Part of the credit for putting the relationship on a positive trajectory and bringing it to the present stage, where we are in multiple conversations with each other at all strategic and diplomatic levels, goes to him", she said in a statement.

"His professionalism, dedication, integrity, and commitment to improving Pakistan-US ties at all times will be remembered not just by us, but by both countries".