Building expertise from the owners
Nadia Saponara and Rebekah Phomsopha founded Oxalis in 2023. They bring environmental planning, building science, and practical certification experience to help your team understand requirements and see the work through.
Meet the founders.
Nadia Saponara
COFOUNDER AND CEO
Nadia is from New Jersey and holds a degree in Environmental Policy, Institutions, and Behavior from Rutgers University.
COFOUNDER AND PRESIDENT
Rebekah Phomsopha
Rebekah is from Virginia, holds a degree in Environmental Policy and Planning from Virginia Tech, and is pursuing a master’s in infrastructure planning and management.
Built by people who stay close to the work
Nadia Saponara and Rebekah Phomsopha founded Oxalis Advisors in 2023. Their work began with ENERGY STAR inspections for homes damaged by hurricanes and grew into certification, testing, compliance, and advisory support for new construction and recovery programs.
They remain directly involved in project strategy, field work, documentation, and problem solving. Clients receive clear answers from the people responsible for the work.
Nadia Saponara
Chief Executive Officer
Nadia is from New Jersey and earned her degree in Environmental Policy, Institutions, and Behavior from Rutgers University in New Brunswick. She brings an environmental policy perspective to project strategy and client decisions.
Outside work, Nadia enjoys rock climbing, hiking, running, snowboarding, and thrifting.
Rebekah Phomsopha
President
Rebekah was born and raised in Virginia. She earned her degree in Environmental Policy and Planning from Virginia Tech and is pursuing a master’s degree in infrastructure planning and management from the University of Washington in Seattle.
Rebekah enjoys paddleboarding, collecting honey from across the country, and photography. She took most of the photographs used across the Oxalis website.
How Oxalis approaches the work
Everyone deserves a safe and comfortable place to live and work. Oxalis helps project teams improve energy performance, resilience, and environmental outcomes through practical requirements that can be carried from plans into the field.
The firm values careful work, responsive communication, and relationships that last beyond a single checklist or inspection.