 Seabrook defeated the 10-year incumbent Vincent A. Marchiselli in the Democratic primary.He was a member of the Assembly from 1985 to 1996, sitting in the 186th, 187th, 188th, 189th, 190th and 191st New York State Legislatures.During his assembly tenure, he created the "Drug Trader Arrests and Conviction Program" that led to over a thousand drug-related arrests and liberated Bronx neighborhoods from the scourge of drugs, drug-related crimes and violence.