[4] He served at the Special Tribunal for Lebanon (STL) as a legal advisor for the defence team of four Hezbollah members, including Mustafa Badreddine, who were allegedly involved in the assassination of former Prime Minister Rafik Hariri.
[6][7] He was appointed labor minister in Najib Mikati's cabinet on 24 February 2012, replacing Charbel Nahas in the post.
[6][8] Jreissati was nominated by the Free Patriotic Movement leader and member of parliament Michel Aoun.
[11] Jreissati's term ended on 15 February when Sejaan Azzi was appointed labor minister.
[2] In 2008, he was named as a member of the board of directors of Emirates Lebanon bank.