Juan Orlando Mercedes

Juan Orlando Mercedes Sena (born 16 June 1957) is a politician and engineer from the Dominican Republic. He is Senator for the province of Independencia, elected in 2006, and re-elected in 2010 with 68% of the votes —the highest percentage achieved for a Senator. He was also president of the Energy Commission.

Mariotti was Governor-Civilian of Independencia from 1998 to 2000 and from 2004 to 2006