After graduation from UNH, Leon went to Washington and became a Federal Executive, with years of service in the Navy, Peace Corps and a government foundation involved in foreign assistance. Since his return to New Hampshire in 1985 he has been involved in real estate and business brokerage. Leon was associated with company founder Stewart Lamprey for many years. He has handled a wide range of businesses, and sold properties from Nashua to north of the notches. He is a member of the International Business Brokers Association (IBBA), The M&A Source, and the New England Business Brokers Association (NEBBA).