The Watertown Fire Department’s newly created assistant fire chief position has been filled by a 14-year veteran of the WFD who hopes build connections with residents and serve the community well. On Monday, Ryan Nicholson began his new role as assistant fire chief. He was promoted recently from deputy fire chief. He said he will be assisting Fire Chief Bob Quinn with some administrative duties, as well as working on outreach to the community. “I’m excited to get started,” Nicholson said.