"And then he had all this knowledge to do with Fire and Emergency, the rural sector, logging, because he was in that field.
"As his deputy, there was nothing more reassuring than to jump in the truck with him and look over and know that he's got your back."
Firefighters from the Mangawhai brigade were called out to their chief's medical event at home on Sunday morning.
"Most volunteers join so they can help their community and they know they run the risk that they will turn up to someone they know. We've done that many times, but you never expect it to be one of your crew," Kerrigan said.
Although it was hard for the firefighters, he said it was good for the family to have people they knew in attendance.
A tribute to Leslie on the Mangawhai Volunteer Fire Brigade's Facebook page attracted more than 100 comments.
One commenter said, "Such a lovely man. The Mangawhai community is all the richer for having Rob. Sending you all (and Rob's family) my deepest condolences at this tragic time."
"Truly saddened to read this post. Rob was a top bloke and leader. I have many positive memories of times past ... RIP mate, fly high. I will raise a glass in memory of your life," another wrote.
Leslie is survived by his wife Michelle,"bonus daughter" Kathryn, his mum, three siblings, two nephews and three nieces.
The funeral will be held at 1pm on Monday, June 6, at Mangawhai Beach School gymnasium, 34 Insley St, Mangawhai, followed by a reception at the Mangawhai Volunteer Fire Station, 197 Molesworth Drive, Mangawhai Heads.