- "If I can nail a killer and his invisibility machine, I'll be a big man in Washington!"
- —Quinn to Barry Allen[src]
At some point, he worked at Costa Luca on the development of a new weapon with Brian Gideon. After an incident where a toxin killed hundreds thousands people in Costa Luca, he covered the incident by stating that it was a simple gas leak. At some point, he worked at S.T.A.R. Labs on a project that develop a toxin that attack the nerve system.
S.T.A.R. Labs quarantine
In 1990, Quinn was placed in charge of the operation regarding S.T.A.R. Labs quarantine after a leak of Project Pandora. He ordered Barry Allen to stay out of the operation and tried to establish contact with the two trapped woman inside S.T.A.R. Labs. Their communication would later be jammed and Quinn deduce that Barry was responsible. Later, he went to CCPD and arrest Barry Allen for interfering with the operation and brought Dr. Cartwright inside his van in order to interrogate him without success. He is confronted by Barry Allen that pointed out that the killed would attack Cartwright since he had already killed Dr. Velinski. Later, when the Flash fought the invisible killer and caused his belt to short out, Quinn recognized him as Brian Gideon. Later, he organized a raid on Gideon's house but still failed to arrest him. Some time later, he ordered his men to break inside S.T.A.R. Labs despite the possibility that it would kill those trapped inside. Despite his belief that they were dead, he was surprised that they were outside when the lab exploded. He encountered Barry Allen again who had informed him that his superior informed the mayor of his actions and called Washington. His partner Edwards appeared and confirmed that she has received orders to put Quinn in suspension. Quinn stated that it wouldn't stop him until Ruth Werneke announced that she will call the hold a press conference and inform them of all of his shady activities. Later, Barry Allen brought him the invisibility belt which has now been broken and told him that the Flash gave it to him.