Ryder System promoted John J. Diez to president and COO. Cristina Gallo-Aquino is promoted to executive VP and CFO. Promotions are effective January 1, 2024. From the South Florida Business Journal. Ryder System (NYSE: R) promoted John J. Diez to president and chief operating officer and Cristina Gallo-Aquino to executive VP and CFO, both effective Jan.