Marin Dima is a professional railway engineer.

He began his career as an instructor of Engineering at Politechnical University Bucuresti in 1971. From 1968 to 1986 he was a Researcher at the Institute for Research and Technology Projects for Transport. He was promoted to Chief of Labor in 1986 and served in that position until 1993 From 1993 to 1999 he was Director of Research Management of REFER, the Romanian Railway Regulatory Authority.

He received his Dipl.-Ing. from the Politechnical University Bucuresti in 1967 where he continues to serve as an assistant lecturer. He is President of the Romanian Association for Quality - Personnel Accreditation Body and a member of the General Association of Engineers of Romania and the Romanian Association of Railway Engineers. He is proficient in English and fluent in French and German.