Born in Viedma, Río Negro Province, Casamiquela studied Agricultural Engineering at the National University of La Plata, graduating in 1973. He also holds degrees in Local Economic Development from the National University of General San Martín and the Autonomous University of Madrid, Spain. He joined the National Agricultural Technology Institute in 1974 as a topsoil specialist, and in 1980 returned to his home province by way of a transfer to INTA's Río Negro Upper Valley Experimental Station. His work as researcher focused on irrigation needs for the orchard-rich Upper Valley, and he went on to direct the facility between 1984 and 1990. He authored the "Project for the Restructuring of Fruticulture in Argentina", among 15 published research papers. Casamiquela was promoted to the post of INTA Regional Director for North Patagonia in 1990. He remained in the post until September 2003, when he was appointed Vice President of SENASA, the food safety regulatory office. The revival of the Agriculture Ministry as a cabinet-level office in 2009, and the appointment of Buenos Aires Province Legislator Julián Domínguez to the post, was followed by Casamiquela's appointment as President of the INTA by Minister Domínguez in October of that year. Casamiquela oversaw the continued revitalization of INTA, which grew from 3,500 employees in 2003 to 7,200 by 2010, while focusing its efforts on the promotion of local agriculture and small farmers. INTA's Prohuerta program, launched in 2005, provided assistance to 630,000 market gardens and 148,000 small farms by 2013, as well as 19,000 rural families in Haiti. Other highlights during his tenure include an instructional program for intensive agriculture methods initiated in South Africa, and the approval for import by China of two of INTA's GMOsoy and one GMO maize varieties. A cabinet reshuffle by President Cristina Fernández de Kirchner in late 2013 led to the resignation of Agriculture Minister Norberto Yauhar and his replacement by Casamiquela. His nomination was welcomed by the head of the influential Argentine Rural Confederations, Rubén Ferrero, who remarked that "we've know him for a long time, and he's knowledgeable about the problems facing agriculture in Argentina; we hope he'll be given the necessary latitude to implement the policy changes we've been advocating for some time now."
