Tim Ritvo, who has served The Stronach Group in a variety of executive capacities since 2011, is leaving his role as chief operating officer of the company effective immediately, according to a release issued Monday afternoon. The company has no immediate plans to fill his position, the release said. "I am honored to have been part of The Stronach Group and am proud of the accomplishments that we have made for the industry across our racing and training programs," Ritvo said. "As a former jockey, passionate fan and life-long horseman,...