The Firm
Our firm was founded in 1972 by Dr. Alberto Katz. Mariano H. Mark and Lisandro S. Aronin became partners in 2004 and 2005, respectively, and in 2013 the firm’s name became Mark & Aronin Attorneys at Law.

Mariano H. Mark
- Law Degree, University of Buenos Aires, 1993.
- Postgraduate Studies in Bankruptcy Law and Corporate Law, University of Buenos Aires, 1994 – 1995.
- Professor of Labor Law at University of San Andres (2019 – Present)
- Professor of Commercial Law and Labor Law at the University of Buenos Aires (2004 - 2012)
- Clerk at the Argentinian National Court of Appeals of Labor (1990-2003)
Author of the books:
- Manual de Jurisprudencia de Derecho del Trabajo y la Seguridad Social (Ed. Abeledo Perrot – First Edition 2003 –Reprinted annually)
- Ley de Contrato de Trabajo. Anotada con Jurisprudencia (Ed. Abeledo Perrot – First Edition 2005 – Ed. Hammurabi- Third Edition 2016)
- Ley de Contrato de Trabajo Comentada (Ed. Abeledo Perrot –First Edition 2006. Second Edition 2011)
Co-author of books:
- Formas y Cláusulas Modernas de Contratación (Ed. Facultad de Derecho – UBA, 1997)
- Letra de Cambio y Vale o Pagare (Ed. Abeledo Perrot, 2005)
- Tratado de Derecho del Trabajo (Ed. Rubinzal Culzoni, 2005)
- Summa Laboral (Ed. Abeledo Perrot, 2011)
- Author of numerous articles of doctrine and annotated jurisprudence published in the journals, “Revista de Derecho Laboral y Seguridad Social", "Jurisprudencia Argentina," and "Revista del Derecho Comercial y de las Obligaciones"

Lisandro S. Aronin
- Law degree, University of Buenos Aires, 2000
- Postgraduate seminar in Common Law, Denver, CO, USA, 2001
- Postgraduate studies in Labor Law – Austral University, 2004
- Clerk at the Argentinan National Court of Appeals of Labor (1993-2003)
- Professor of the courses “Labor Law and Social Security Law,” “General Theory of the Law” and “Interpretation of the Law Buenos Aires (UBA, 2000 – 2015)
- Professor of courses on Individual Labor Law, Collective Labor Law, and Social Security at the Catholic University of Salta, (2004)
- Coordinator for Postgraduate Studies in Healthcare Law at the Catholic University of Argentina, (2005-2008)
- Editor of the Journal of Labor Law and Social Security (Ed. Lexis Nexis / Abeledo Perrot 2003-2010)
- Author of numerous articles of doctrine and annotated jurisprudence published in the journals, “Revista de Derecho Laboral y Seguridad Social", "Jurisprudencia Argentina," and "Revista del Derecho Comercial y de las Obligaciones"
- Contributing author to collective work, “Summa Laboral” (Abeledo Perrot, 2011)