RNA - Speaking to Al Jazeera on Thursday, Kamel Jendoubi said his panel had presented a list of human rights abuses to the UN, following a report in August that pointed to a “substantial number of violations of international humanitarian law” in the Saudi-led war.
Saudi Arabia and its allies have been critical of the UN panel’s work.
"I did not expect such a harsh reaction, we've done a professional, neutral and objective job," Jendoubi told Al Jazeera.
"All we did was report based on allegations and actions we collected during our visits, from testimonies and reports... It's a normal process for any experts," he said.
The August report blamed airstrikes by the Saud-led military coalition as the most direct cause of civilian casualties in the war, which began in March 2015 as an attempt to overthrow the Houthi Ansarullah movement and reinstate former fugitive president Abd Rabbuh Mansour Hadi.
According to Press TV, Jendoubi’s report also mentioned a long-running blockade of Yemeni ports and airspace by the Riyadh regime and its allies as a possible violation of international humanitarian law.
Some 15,000 Yemenis have been killed and thousands more injured since the onset of the Saudi-led aggression.
More than 2,200 others have died of cholera, and the crisis has triggered what the United Nations has described as the world's worst humanitarian disaster.
This is while Riyadh and its allies have repeatedly denied allegations of war crimes, insisting that their attacks are not directed at civilians despite abundant evidence that they have targeted weddings, funerals, hospitals as well as water and electricity plants.
The report noted that the Saudi alliance had carried out around 16,000 air raids carried out against Yemen.