Appointed by Governor Roberto Sánchez Vilella, he served from 1966 to January 2, 1969, when he was responsible and led the first transition team under the Puerto Rican Constitution to the opposing political party.

In June 1939, at the request of Carlos Esteva, then Director of the Tobacco Institute, he had his first official job at an experimental station that had been recently established in Puerto Rico.

Employment opportunities were still difficult, but some jobs were by then being created on the island as a result of Luis Muñoz Marín's initiative for Puerto Rico, which joined in the type of social programs that President Franklin D. Roosevelt had implemented in the United States.

From 1973 to 1977, during the administration of Governor Rafael Hernández Colón, Irizarry served again the People of Puerto Rico as a member of the Higher Education Counsel.

[2] The Colegio de Agrónomos, the mandatory-membership guild of agronomists that he co-founded in 1940, will honor his legacy of public service on June 19 in San Juan, Puerto Rico.