Management Team

Peter Brereton co-founded Tecsys more than 40 years ago and has been instrumental in shaping the company’s direction ever since. In the early years, he led software development before taking on broader leadership responsibilities across product management, sales and marketing. He was appointed president in 1995 and became CEO in 1998, leading the company through its IPO on the Toronto and Montreal stock exchanges.

Under Brereton’s leadership, Tecsys has expanded its global footprint and deepened its expertise in complex, high-volume supply chains. He spearheaded the company’s strategic expansion into healthcare, establishing a market-leading presence across the healthcare ecosystem while also driving growth across distribution, retail and third-party logistics. Today, Tecsys is an award-winning global company that combines advanced technology, SaaS solutions, data and AI with deep industry expertise to help organizations transform supply chain performance.

Brereton was recognized as an EY Entrepreneur of the Year award winner in Quebec in 2019.

Mark knows that a company’s long-term success is heavily rooted in a disciplined approach to its bottom line. An expert in financial management with a focus on technology and software, Mark joined Tecsys in 2018. He is no stranger to tackling daunting challenges and finding the best path forward. In fact, he relies on these skills every time he hits the open road on his bike in the summer and heads for the slopes in the winter for telemark skiing and alpine touring.

Mark has more than 20 years of international experience and was previously Chief Financial Officer for Aptos Retail. In addition to playing a significant role in the formation and growth of the company, he led the successful transition of the business’ retail management enterprise solutions to a cloud-centric platform. Prior to his work at Aptos Retail, he served as Vice President, Finance, for Epicor Retail, a division of Epicor Software Corporation that was later spun out to create Aptos. In addition to building and leading teams with both companies, Mr. Bentler also played a key role in managing financing and M&A activity. Earlier in his career he worked with KPMG in the United States and Switzerland as a Senior Manager.

Rex Ahlstrom is a seasoned operational executive and technology evangelist with over 25 years of experience in the data, AI, cloud and enterprise software domains. He has a proven track record of driving digital transformation, developing visionary strategies, and fostering innovation. In his prior role as CTO, EVP Innovation & Growth at Syniti, Rex successfully transitioned the company to a SaaS model, driving revenue growth across multiple regions and securing strategic partnerships with global leaders like SAP, IBM and AWS. 

 Previously, Rex founded and led SOALogix, which was acquired by SAP, and built MSI Software from the ground up, achieving significant market penetration and strategic partnerships. His career also includes roles at SAP, TeleSciences CO Systems, Defense Systems Incorporated, Westinghouse Electric Corporation, and SGS Thomson, where he led numerous high-impact projects and initiatives. 

 Rex holds a Master of Science in Electrical Engineering from The Johns Hopkins University and a Bachelor of Science in Electrical Engineering from Drexel University. He is a recognized industry expert, IBM Champion, and member of the MindShare Alumni Network. In his free time, Rex enjoys extreme skiing, playing guitar, fitness, yoga, boating, and offshore fishing. 

Vito knows that when it comes to architecting solutions to complex problems, mobilizing the team is the first step toward a successful result. He makes customer satisfaction his top priority and achieves it through strong service delivery with every engagement. Vito joined Tecsys in 2017 and helps customers build strong project teams while developing individual skillsets related to Tecsys solutions. He’s honed this valuable skill after years of coaching his kids’ hockey team, always encouraging the drive to win while building resilience and life-long learning.

Vito is a seasoned business leader with extensive experience in partnering with customers to shape and deliver supply chain and ERP solutions across a variety of industries. Prior to joining Tecsys, he spent more than 26 years at Accenture, where he was the managing director of the Montreal office. In this role he grew, managed, coached, and deployed a 400-person workforce and significantly grew the office’s client base. 

Nancy understands that successful businesses are built on teamwork. Having practiced a diverse number of team sports, she appreciates the power of collaboration within high performing teams. She places a great value on creating exceptional corporate cultures that foster inclusion and leverage everyone’s talents to lead a successful people-first agenda with authenticity, passion, and integrity.

Nancy brings 25 years of experience in human resources management. As the Chief Human Resources Officer, she has leadership of the entire HR function, ensuring that talent initiatives are fully aligned with the company’s growth plans. Prior to joining Tecsys, she held executive HR roles at Fiera Capital and Miranda Technologies. Earlier in her career, she honed her HR leadership skills at Citigroup, Pratt & Whitney Canada and Pfizer.

Nancy holds a Bachelor of Commerce in Psychology and Organizational Behavior from McGill University. She recently completed a Certificate in Diversity and Inclusion for HR at Cornell University and is a member of the Ordre des conseillers en ressources humaines agréés du Québec.

Chuck brings a wealth of legal expertise and strategic insight to Tecsys, ensuring compliance and guiding the company through complex legal landscapes. With a robust background in litigation and commercial contracts, Chuck has consistently demonstrated a keen ability to navigate and resolve intricate legal matters, safeguarding the company’s interests and fostering a secure operational environment. Before joining Tecsys, Chuck served as legal counsel for a prominent healthcare vendor, gaining valuable industry-specific experience.

Chuck's philosophy as chief legal officer is deeply rooted in the belief that exceptional customer service is fundamental to legal practice. By prioritizing transparency, responsiveness and proactive problem-solving, Chuck ensures that legal strategies are aligned with Tecsys' commitment to delivering outstanding value to its customers, where precision and reliability are paramount.

Chuck holds a Juris Doctor from Columbia Law School and a Bachelor of Arts in from the University of Michigan. Outside of his professional role, Chuck enjoys reading literature and detective noir, and is dedicated to fitness, balancing a demanding career with a healthy lifestyle.

Shannon believes that we are the best stewards of our brand when we are led by passion for customer success. With more than 25 years of experience developing and executing strategic B2B marketing and communications plans, she brings a wealth of expertise to the Tecsys marketing organization across digital, global corporate and product marketing initiatives. In her spare time, you may find her Peloton pushing her to her limits, where she embraces both the challenge and the reward of hard work and continuous improvement.

Shannon joined Tecsys from Intelex, where she served as CMO. Prior to Intelex, she was vice president of Industry Marketing at SAP where she built the company’s first Global Integrated Demand Team dedicated to supporting Enterprise and Mid-Market sectors. She has likewise held various global and regional marketing leadership roles at IBM and PwC Consulting. Her diverse career has also included editorial, marketing, and public relations roles in both consumer electronics and publishing industries, and she is the author of three highly acclaimed books.

Bill understands that delivering customer success requires discipline, sharp planning, and flawless execution at every step of the journey, skills he hones both at Tecsys and in his spare time as an avid IRONMAN competitor. This approach drives his laser focus on helping customer organizations build winning supply chains through Tecsys’ go-to-market strategy and expansion.

Bill has a remarkable track record of empowering companies to overcome complexity by leveraging technology. Prior to joining Tecsys, he held executive sales leadership positions at Oracle in the North American Sales organization, most recently as vice president of key accounts and previously as group vice president of North America Storage Sales. Prior to Oracle, Bill was with Fujitsu for over a decade and held a variety of executive management positions. These included executive vice president of the Platform Product Group in the Americas and executive vice president of the Global Retail Business. Bill draws from this wealth of experience to help Tecsys customers establish their path for long-term success.

Innovative R&D is critical to Tecsys’ brand promise in this dynamically changing environment facing our customers. Martin joined Tecsys in 2021 and leads this important responsibility to equip customers with innovative and mission-critical supply chain capabilities. As a seasoned and high-caliber individual, he guides overall product strategy and spearheads product development from architecture to delivery. Martin and his team truly embrace quality and scalability in order to meet challenges and drive business results.

Martin brings over 25 years’ experience in software development. He is a global R&D business leader with a strong record in building robust and effective product development teams. Prior to joining Tecsys, Martin worked for Nokia where he led an internationally distributed team of 500+ engineers delivering on product architecture, development and support. His experience and perspective help to serve Tecsys’ R&D department and make a positive contribution to the evolution of its offering.