Grupo Petersen | 36,860 followers on LinkedIn. Grupo Petersen is presently an important conglomerate of Argentine companies active in all regions of the country. The group is diversified into areas such as engineering and construction, banking, agriculture-based industries, and urban maintenance. Created in 1920 as an Engineering and Construction company, Grupo Petersen has throughout its history developed and managed a large number of public works and private projects in Argentina and neighboring countries.