SAN FRANCISCO--(BUSINESS WIRE)--RichRelevance®, the global leader in omnichannel personalization, today announced two key executive appointments with deep experience in data, analytics and retail personalization. Former WalmartLabs executive Mahesh Tyagarajan will serve as Chief Product Officer with full responsibility for product strategy and management, engineering and cloud operation and infrastructure. Microstrategy and Business Objects veteran John Dickson will be Vice President of Client