Mark R Johnston MD 145 Huguenot St New Rochelle, New York, Phone: 914-235-1888 Company Name: Westchester County Department Of Health Doctor Category: Family Medicine Profile Let this business know you found them on Westchester Magazine's Online Directories. Locations New Rochelle 145 Huguenot St New Rochelle, New York 10801-5234 Claim/Edit Listing