Tyson leads the firm's Climate Change Practice, providing critical guidance to clients as they navigate the energy transition. He has advised on many of North America’s most high-profile energy projects, including on the development, permitting and financing of more than 50 wind, solar, gas, hydro and energy storage projects, together representing over 7,000 MW in installed capacity, as well as on significant electricity and gas transmission projects. He also advises on major carbon management projects, including innovative carbon dioxide removal projects and some of the world’s largest carbon capture and sequestration projects. Tyson gives strategic advice in navigating complex and often challenging environmental assessment and permitting processes, as well as on negotiations with regulatory agencies, Indigenous communities, local municipalities and other stakeholders.

Tyson also has decades of experience in the carbon markets, having worked on some of the country's earliest carbon offset deals and emissions reduction funds. He now advises clients with responsibility for over 100,000 kilotonnes of GHG emissions as they transition to a low-carbon economy. He is regularly retained to advise on the development of carbon trading and compliance strategies, on agreements for the purchase and sale of carbon credits and renewable energy certificates (in both compliance and voluntary markets), and on long-term offtakes for carbon removal and avoidance projects. He has negotiated transactions in every major North American compliance market, and under every major voluntary standard.

As a co-leader of the firm's Sustainability Practice, Tyson also regularly advises on high-stakes, reputationally sensitive ESG issues for major financial institutions, pension funds, asset managers and energy and resource companies. He is currently helping some of the country's largest companies in developing their strategies to achieve net zero GHG emissions. He also advices these clients on their climate-related disclosures (both under evolving securities laws and voluntary reporting frameworks such as the final CSSB standards), including on strategies to mitigate greenwashing risks.

In the mining and metals sector, Tyson acts for companies acquiring, financing, developing and operating major uranium, potash, coal and precious metals operations across the country. He regularly advises these clients on stakeholder relations and permitting, compliance and enforcement matters, including investigations and prosecutions under provincial and federal environmental laws. He has also worked with national and provincial industry associations on strategies to address environmental risks and seize climate change-related opportunities.

Tyson advises clients in many other sectors, including pulp and paper, water treatment, communications, iron and steel, chemicals, and manufacturing. He provides advice on the full range of issues in the environmental and energy-regulatory fields, including environmental assessments, project permitting, contaminated sites remediation, endangered species protection, spills response and reporting and the inspection, investigation and defence of environmental offences.