He holds a degree in Political Science with a political economy focus.

He is the founder, President and CEO of SABELT S.p.A., a leading manufacturer of high-end car seats, seat belts, technical clothing for motorsport and special applications of restraint systems in the aerospace sector.

He is Vice President and Managing Director of Holding M. Marsiaj & C, founded by his father Michele in 1947.

He is one of the founders of the private equity fund Charme and is on the Board of Directors of Vittoria Assicurazioni S.p.A. and Fenera Holding S.p.A.

From 1985 to 2015, Marsiaj held the roles of President, CEO and VP Fiat Group Global of TRW Automotive Italia.

From 2016 to 2020, he was President of Amma and Vice President of the Industrial Union of Turin, of which he became President from 2020 to 2024, together with the Council for the Enhancement of the Artistic and Cultural Heritage of Turin.

He has been on the General Council of Confindustria since 2016.

Since 2024 he has been the Confindustria President's Delegate for the Space Economy.