[7] He helped establish the School of Economics at the Universidad Nacional Autónoma de Honduras where he taught for twenty-five years.

He helped create and was president of many companies, in the areas of paper, hotels, real estate, insurance, and others.

[19] After completing his studies in Michigan, in 1944 Vinelli was hired by the Federal Reserve Board of Governors in Washington, D.C.

He was released from service as World War II wound down and the need for soldiers was greatly reduced.

[21] Vinelli was the lead economist on that mission and worked with members of the Honduran Ministry of Finance in drafting the legislation.

[24] Vinelli worked with a Honduran commission appointed by Gálvez, an advisor from the International Bank for Reconstruction and Development, and bankers from Guatemala and El Salvador.

[27][21] Vinelli remained in Honduras as Economic Advisor to the governments of Juan Manuel Gálvez and then Julio Lozano Díaz.

By the end of that year he joined Banco Atlántida, one of the largest private banks in the country, as Assistant to the Chief Executive Officer (CEO).

[27] He also spearheaded a group of investors to create and grow a wide variety of companies, bringing advanced know-how to many industries.

[5] Some of the companies he helped start or grow were: Embotelladora La Reyna (Pepsi Cola bottling company),[21] Hoteles de Honduras which owns the historic Hotel Honduras Maya,[35][36] Cartonera Nacional, Convertidora Nacional de Papél y Cartón (paper/cardboard), Lotificadora San Fernando, Lotificadora Industrial, Rancho El Coco (real estate).

[5] The international banking contacts he made at these meetings were beneficial not only to Banco Atlántida but also to the government of Honduras, who he continued to advise in different capacities over his lifetime.

[43][44] It was later revealed that the organization who held him was the Farabundo Martí National Liberation Front (FMLN) of El Salvador.

These included Jose Antonio Velásquez, Carlos Garay, Luis Padilla, Sergio Almendares, César Ordoñez, Arturo López Rodezno, Maury Flores, Roque Zelaya, Hermes Maltéz, Benigno Gómez, Miguel Angel Ruiz Matute, German Durón Lanza, and Manuel Rodriguez Lazaroni.

[51][52] Vinelli also created important collections of Mayan artifacts,[5] stamps,[53] coins [54] and bills [5] at Banco Atlántida.

[56][5] Biografías Ilustradas: Doctor Paul Vinelli, Oscar Acosta and Vicente Machado Valle, Tegucigalpa Honduras: Evensa, 1997.