Doctor in Law and Social Sciences graduated from the University of the Republic of Uruguay in January 23rd, 1967.

Member of Rachetti Law Firm 1967 – 2012.

Member of Legal Advice Office and Lawyers’ Board of the Bank of the Republic of Uruguay for 34 years. He was joined as Legal Advisor in September 23rd, 1968, then, he was appointed Head Lawyer (position that become Consulting Lawyer) and President of the Lawyers’ Board in June 27th, 1984.
He held such position until August 8th, 2002, when he resigned it to completely dedicate himself to his professional activity and journalism.- As representative of the BROU (Bank of the Republic of Uruguay) was an active member of the Latin American Committee of Banking Law from 1986 to 1989. In 1989, he held the position of Vice-president until 1991 and he was President until May 1993. As from that date, Mr. Sienra was a consulting member of such Committee.

As from May 1989, he was columnist and editor for the newspaper “El País” (Uruguay).
He acted as sports administrator in the position of Secretary of the “Consejo de Neutrales de la Divisional B” (Council of Neutrals of the Uruguayan Football League Second Division) from 1975 to 1977 and General Secretary and President of “Club Nacional de Football” from 1980 to 1985.

He is the author of the book “Entre el cielo y el infierno” (Publishing House “Editorial de la Plaza”, December 1985).- “El secreto bancario en Uruguay” (Bank Secrecy in Uruguay), Magazine of Latin American Law, De Palma, 1995.-