About Treez

John Yang is a cannabis technology pioneer who co-founded Treez in 2016 to transform how retailers operate and grow. As CEO, he has led the company through rapid growth and industry-defining innovations, building Treez into one of the most trusted commerce platforms in cannabis retail serving over a dozen states. His leadership has helped set new standards for retailer performance, compliance, and deep innovation in a highly regulated market. Before founding Treez, John developed his expertise in technology and business operations at Accenture and Slalom Consulting.

David Yan has served as CFO of Treez since 2019, guiding the company’s growth, strengthening its financial position, executing the Series C financing, driving operational rigor, and leading M&A transactions. He oversees Finance, Business Operations, and People/HR. With 20 years in SaaS and financial leadership, David has served as VP of Finance at Wrike (acquired by Vista Equity Partners) and Womply, led S-1 preparation at ForeScout, and held finance roles at Twitter and other venture-backed startups after starting his career at KPMG. In 2023, he was named to Finance & Investing magazine’s list of Top 25 Software CFOs to Watch, recognizing excellence in financial leadership across the software sector.

Shareef El-Sissi is a co-founder of Treez and a pioneering figure in California’s cannabis industry. Currently, the founder and CEO of Nexus Agriscience and former CEO of Eden Enterprises. He helped shape the state’s legal cannabis market through innovative cultivation, retail, and product ventures. His deep industry knowledge and entrepreneurial track record continue to inform Treez’s long-term vision and strategy.

Ethan Chong has led Treez’s engineering organization through multiple phases of growth, delivering the scalability, security, and speed required to compete in a regulated market. He builds high-performing, cross-border teams and delivers complex SaaS, IoT, and retail platforms that meet both customer and compliance demands. At Treez, he has driven platform upgrades that modernized architecture, strengthened security and compliance, and accelerated the delivery of new capabilities. His leadership at Treez spans teams in the US, Canada, and India. Prior to Treez, Ethan led engineering at Awair, Grocery Outlet, and GE Digital after starting in technology consulting with Accenture and IBM.

Joey Sterling is a founding-era leader at Treez who has shaped the company’s commercial and product direction from its earliest days. Over more than eight years, he has led Sales, Customer Success, and Product, steering the organization through major growth milestones and market shifts. Today, Joey oversees Product Management and Customer Success, bringing a hands-on understanding of retailer operations and the cannabis market to deliver solutions that drive efficiency and revenue growth for leading cannabis retailers. His cross-functional leadership has been instrumental in defining Treez’s market position and product vision.