PORTAGE, Mich. (AP) — A man in charge of transportation at a southwestern Michigan school district has died while shoveling snow.

Portage district officials say Mike Westbrook died Saturday from a heart attack.

Superintendent Mark Bielang told families that Westbrook’s “work impacted every student who rides a bus.” He says Westbrook was “masterful” at bus logistics in the Kalamazoo-area district.

More than 5,000 Portage students ride buses. Westbrook had worked for the district since 2002.