He is specialized in national and international corporate tax planning. He has wide experience in business acquisitions and transformations; taxation of intangibles; digital economy; trusts, corporate financing, and agreements to avoid double taxation. He represents taxpayers in complex litigation procedures involving different tax authorities.

Before joining Bomchil, Mariano founded the firm Teijeiro & Ballone Abogados in 2012. He also worked in the Legal Department of the Argentine Revenue Service (AFIP for its Spanish Acronym).

Mariano participated as Argentine rapporteur at the 66th Congress of the International Fiscal Association (IFA), and has coordinated various regional and international seminars related to his area of expertise. Additionally, he serves as Director of the Tax Module of the Master in Business Law at the Universidad Católica Argentina