1985: Dr. Ali Yassien was appointed as a prosecuting attorney in the Egyptian General Prosecution where he progressed in it till, he served as a head chief prosecutor also he was delegated to work in the attorney-general office “Inspectorate”.
2001: Dr. Ali Yassien was appointed as the head chief of Cairo court for urgent matters till 2002.
2006: Dr. Ali Yassien was appointed as Vice-President of the appellate court till the start of 2007, where he ended his career as a Judge and detected his time for his studies and arbitration.
2007: Dr. Ali Yassien started his career as a professional arbitrator, where he was nominated as an arbitrator in many important disputes.
2011: Dr. Ali Yassien was nominated as the councilor of HSBC Bank, EMRC-EGYPTIAN MORTGAGE REFINANCE COMPANY, EHFC “Egyptian housing finance company”.
2013: Dr. Ali Yassien was nominated as the councilor of Memaar Almorshedy.
2014: Dr. Ali Yassien was nominated as the legal councilor of PHD “Palm Hills Development”.