This testimonial letter certifies that Marcelo Cotroneo worked for Wartsila Colombia S.A. from 2000 to 2007 in roles such as Electronic Superintendent Engineer, IT Manager, Services Sales Manager, and General Ship Power Sales Manager. The letter states that Cotroneo showed good technical and commercial background and made accomplishments to help the company achieve its targets. He made an outstanding contribution to technical and sales fields in Colombia and Venezuela. The letter writer, Urbano Ardila Plata, has known Cotroneo for 10 years both technically and professionally, and says he is a person oriented to serve customers and colleagues with good analytical thinking and capabilities to work in different country environments.