Rich Kroczynski

Significance: Kroczynski is one of what he calls a dozen "hardcore" volunteers in the Cuyahoga Valley National Park. He recently hit 2,000 hours of volunteering with the park, which he has been doing for about eight years.

Interest in the environment: Kroczynski is originally from New Jersey. He moved to Ohio for work and raised his kids there. He then moved away for 12 years to South Carolina, where he started doing volunteer trail maintenance in a state forest, and he and his wife retired to Ohio about eight years ago.

Volunteering is a family affair for Kroczynski, whose wife, Marilyn, volunteers with him and whose son has worked for parks.

"We've also volunteered in the trailblazer program where we patrol the towpath, both my wife and I and my son."

Why I do what I do related to the river: "Number one, it needs to be done, and number two, the park can't do it on their own."

Why he likes volunteering: "This is perfect for us, being outdoors," he said. "If you enjoy it, it's a no-brainer."