50 year old Robert Christian was last seen April 12th at the Stewart's Shop on Vandenburgh Avenue in Troy. He is 5'9" tall and approximately 180 lbs. He has brown eyes and brown hair. Police say Christian suffers from mental illness and substance abuse and is known to frequent South Troy. Christian's car is also missing. It is a 2009 Kia Rio 4-door gray sedan. Plate HRU3513. Anyone with information is asked to contact North Greenbush Police at 518-283-5323.