Alex Roessner is co-founder of Landseed PBC, where he is building measurement infrastructure for ecological markets alongside Greg Curtis, Patagonia's former Deputy General Counsel. Landseed deploys continuous sensor networks on conserved land and issues Earth Credits — instruments that measure ecological condition across six dimensions, anchored to county-recorded legal deeds, designed to replace the estimation architecture of the voluntary carbon market.

He arrived at this work from the field. Roessner has tracked Sumatran tigers in the Leuser Ecosystem, documented grassroots lemur conservation in Madagascar, surveyed unmapped terrain in Ecuador's Chocó, followed wild pumas through Patagonia, and photographed sperm whales in Dominica, where he built a computer vision software that identifies individual whales from underwater photographs. A co-authored paper on cetacean re-identification is expected in 2026.

He also arrived from markets. As Managing Partner of Mythos Liquid Capital, a systematic digital asset hedge fund, he developed the quantitative orientation that shapes how he thinks about ecological market design. He founded the Roessner Restoration Initiative, a 501(c)(3) operating across four continents, and serves as Vice President of the Savia Foundation.

Roessner graduated from Northwestern University in three years with a double B.A. in Economics and Environmental Policy while competing as a Division I baseball player, and was named one of Northwestern's Trienens Institute “Grads to Watch” for the Class of 2025. He is proficient in Mandarin and based in New York.