I’m a passionate environmental scientist, consultant, and expert witness with over 20 years of experience helping organizations navigate complex challenges related to air quality, public health, and environmental compliance. As Founder and CEO of CHANGE Environmental, I lead a team committed to delivering strategic, science-based solutions that make a real difference. I’ve had the honor of supporting national health initiatives, advising on legal cases, and lecturing at institutions like Harvard, all while staying grounded in my mission to protect people and the planet.

After 17 years of working at the intersection of healthcare, plant science, and regulatory innovation, I’ve taken the time to reflect on the journey that’s brought me here—and where I aim to make the biggest impact next. From toxicology labs to multi-state cultivation operations, my career has been shaped by science, strategy, and a drive to lead with purpose. Here is my biography.

Ryan K. Stansfield is a seasoned leader with over 23 years of experience in small molecule drug discovery and development. Currently serving as Director of DMPK-Toxicology at 858 Therapeutics, he has successfully led teams through critical phases of drug development, including managing IND-enabling toxicology studies and building high-performing scientific teams. Stansfield is recognized for his deep expertise in ADME, safety pharmacology, and toxicology, as well as his strategic ability to drive projects from discovery to clinical trials. Throughout his career, he has demonstrated exceptional communication skills, collaborating across functions and ensuring timely, rigorous data to support regulatory submissions. With a proven track record in managing budgets, experimental design, and in-licensing diligence, Stansfield has contributed to the successful advancement of multiple therapeutic candidates.