Dan Molloy is a research scientist studying diseases in aquatic organisms like zebra mussels. Zebra mussels were accidentally introduced to North America in 1988 and have caused ecological, recreational, and industrial problems. Molloy discovered the bacteria Pseudomonas fluorescens CL145A is lethal specifically to zebra mussels when ingested. Laboratory and field tests showed it is an effective and environmentally-safe control method. However, more research is still needed to determine if it can be used in lakes and rivers for containment purposes.