Changquan Ye

Changquan Ye, doing business as Green Leaves, a self-certified small disadvantaged business sole proprietorship based in Poolesville, Maryland, provides scientific consulting services to federal research agencies as a prime contractor on a direct (no set-aside) basis. The vendor operates exclusively in a prime capacity and competes in full-and-open procurements without set-aside designation.

Green Leaves specializes in neurological and sensory research consulting, with demonstrated expertise in synaptic dynamics, sensory-motor integration, and neuroscience support for federal mental health and substance-abuse research initiatives. Recent work includes a $24,862.50 firm fixed-price purchase order from the National Institute of Mental Health awarded January 26, 2026, for scientific consulting services with completion through January 2027; a $31,200 firm fixed-price purchase order from the National Institute on Drug Abuse awarded November 15, 2024; and a $20,160 firm fixed-price purchase order from NIMH awarded May 3, 2024, for consulting services on synaptic dynamics of sensory-motor integration.

The vendor's customer base is concentrated within the National Institutes of Health ecosystem. Two federal agencies account for 100% of recent awards: the National Institute on Drug Abuse (2 awards, $115 thousand combined potential value) and the National Institute of Mental Health (2 awards, $45 thousand combined potential value). Total awards in the source data span four prime contracts with combined potential value of $160 thousand, of which $142 thousand has been obligated, with activity in 2021, 2024, and 2026. One award (combined potential value $25 thousand) reaches ultimate completion within the next twenty-four months and faces recompete exposure. The vendor has not held parent contract vehicles, BPAs, or IDIQs and operates solely on individual purchase orders.