From 1974 to 1994 he served as a scientist in various institutions in Brazil, as the Center for Nuclear Energy in Agriculture USP, the National Research Center for Fruits of Temperate Climate of EMBRAPA and the Cocoa Research Center of CEPLAC. While in these organizations he worked primarily in the development of mathematical models for simulation of agricultural, economic and ecological systems. On some occasions he exercised administrative positions and also teaching activities, taught post-graduate courses at ESALQ / USP (1981-1985) and at the State University of Santa Cruz-UESC (2001 to 2003). He also has developed several software and information systems for technical issues.

From 1994 to 2001 his activities focused on international plant protection problems, as Technical Secretary of the Plant Protection Committee of the Southern Cone (COSAVE) and as Head of Division of International Affairs of the Department of Plant Protection and Inspection of the Ministry of Agriculture. During this period he worked with the International Plant Protection Convention (IPPC / FAO) on the development of several International Standards on Plant Protection.

He was also a consultant for the IICA and an expert for a dispute settlement process of the World Trade Organization (WTO).

Today is at ESALQ / USP developing mathematical models for pest risk analysis, and should return shortly to its activities in CEPLAC.