Jose Roberto L. Del Rosario Jr., MBA

Siegfred B. Zarriz is a corporate trainer with over 13 years of experience in customer service, contact center operations, and learning & development. Having spent most of his career with Transcom, he has trained and coached new hires, supervised nesting programs, developed training materials, and led upskilling initiatives for global telecommunications and customer service accounts. His expertise in coaching, performance improvement, and operations support enables him to deliver practical, workplace-focused training that enhances employee performance and customer experience.

Jan Nigel Teves is a Learning and Development professional with extensive experience in instructional design, training facilitation, and organizational capability development. He has led learning initiatives across the retail, healthcare, government, and education sectors, designing and delivering impactful training programs using the ADDIE framework. As a Certified Learning & Development Professional (CLDP), Nigel specializes in creating engaging, learner-centered experiences that strengthen leadership, customer service, onboarding, and workplace performance. He is passionate about helping individuals and organizations build practical skills that drive continuous growth and operational excellence.

Mary Ann E. Ventura is a seasoned Human Resources executive with nearly 20 years of experience in talent acquisition, learning and development, organizational development, employee relations, and leadership coaching. She has led HR functions across the banking, retail, direct selling, and corporate sectors, partnering with executive leaders to build high-performing teams and develop people-focused strategies. With extensive experience in recruitment, training, coaching, and culture building, Mary Ann is passionate about helping organizations attract, develop, and retain top talent while driving sustainable business growth.