About TMS
Named after the tiles that form a mosaic, Tessera leverages technology and artificial intelligence to make a clear picture out of fragmented data.
Tessera was created by TMS – the same team behind British Columbia’s highly successful PRISM Clinical Registries platform used by over 1,400 health care professionals for 1.9 million unique patients – including organizations like Cardiac Services BC,  BC Transplant, Trauma Services BC, Cystic Fibrosis Care BC and Stroke Services BC.
TMS has been proudly serving clients in the Canadian healthcare sector since 2016.

What Sets Us Apart

Deep Expertise

We are experts who leverage our extensive healthcare knowledge to build complete solutions – from concept through to implementation.

Innovative Mindset

We stay ahead of the curve, proactively embracing change and continuously finding ways to improve our products and increase the value that they provide to our clients.

Delivery-Oriented Culture

We believe in getting things done – quickly, accurately and sustainably. Our team prioritizes efficient processes, attention to detail and a commitment to deadlines to provide our customers with timely and reliable service.

Leadership Team

Don MacArthur

Chief Innovation Officer

Bio

Don is responsible for looking ahead, exploring new ideas and figuring out how they can be turned into actual products and services that make a real impact for our customers.

 

With 27 years of experience in health systems technology, Don brings a deep understanding of solution and architecture design. Having worked across public and private sectors with organizations like Alberta Health Services and the Provincial Health Services Authority (PHSA), he has tackled everything from implementing large-scale electronic medical record systems and managing ambulance services to building data repositories and enhancing diagnostic imaging. This diverse background gives him a well-rounded perspective that he uses to drive innovation at TMS.

 

Don has a bachelor’s degree in biochemistry and medical microbiology as well as a certificate in computing and information systems, giving him a unique blend of technical understanding and analytical rigour that informs his approach to innovation and delivery at TMS.

Michael Watson

Chief Operating Officer

Bio

Michael leads operations, partner development and strategic scaling at TMS with a focus on designing systems for growth, driving business development and building strong relationships with healthcare clients, strategic partners and delivery teams.

 

Michael brings over 20 years of experience in service delivery, workforce strategy and operational excellence. He played a founding role in shaping TMS’ mission and delivery model – transforming it from a recruitment-led initiative into a managed services firm supporting registry modernization, application support and health data analytics.

 

In addition to his leadership role at TMS, Michael maintains a fractional role as Partner at TEEMA Solutions Group, one of North America’s leading talent firms, where for 15 years he specialized in designing custom workforce solutions for public sector and enterprise clients.

 

Michael holds a bachelor’s degree in business administration from the British Columbia Institute of Technology.

Edward Ratnarajah

Chief Strategy Officer

Bio

Edward leads our strategic direction and key partnerships, guiding cross-functional teams towards sustainable growth. He also acts as a bridge between internal stakeholders and external collaborators, driving alignment between commercial execution and long-term vision.

 

With over three decades of leadership in healthcare operations and innovation, Edward brings a wealth of experience to the executive team. In addition to his role with TMS, he also serves as Chief Strategic Partnerships at Thrive Health, where he contributes to national health innovation initiatives. He previously served as National Director of Strategic Partnerships at LifeLabs where he played a pivotal role in modernizing diagnostic services, forging strategic alliances and advancing digital health solutions. Prior to that, he held senior operational roles at the Provincial Health Services Authority and the BC Centre for Disease Control.

 

Edward holds a bachelor of sciences degree in microbiology from the University of British Columbia and has completed the Centre for Creative Leadership’s intensive executive program on transformational leadership.

Kristina Friesen

VP, Products & Delivery

Bio

Kristina leads product strategy and solution delivery at TMS, overseeing the development of both Tessera and PRISM, the registry ecosystem built in partnership with the Provincial Health Services Authority.

 

Kristina’s career spans scientific research, stakeholder-driven environmental policy and digital health delivery. Before entering the health IT space, she worked as a scientist with Environment Canada and later led a regional air quality organization coordinating multi-sector monitoring and planning efforts. These experiences have given her  a systems-thinking mindset and a deep respect for data quality and public-sector accountability.

 

Kristina holds a bachelor of science specialization degree in chemistry and certifications in business analysis and Epic clinical systems. At TMS, she is also leading the company’s exploration of AI and advanced analytics platforms like Microsoft Fabric to enhance the reach and relevance of registry-based tools.