NAME Karen McGuire
POSITION Customer Service Manager
AT CELLMARK SINCE 2017
What do you do at CellMark?
– I work for Semper CellMark at CellMark’s Recycling division. I do customer service and some inside sales. I’m also the office manager for the Chicago office, responsible for ensuring everything is billed correctly by the end of the month. I do just about anything they ask me.
How would you describe the way we care for each other at CellMark?
– I think we care for each other really well, especially in the Chicago office. We’re a close-knit team, always in touch and ready to help, whether it’s work-related or personal. Since CellMark acquired Semper in 2017, it’s been a positive experience. We’ve felt well-treated and we truly appreciate that.
You made a charity nomination for CellMark Cares this year. Tell us more!
– It is really nice that CellMark lets its employees recommend local charities for company support. When I learned about the initiative, I thought: “Oh my gosh, I’ll nominate The Chicagoland Dog Rescue!”. It is an all-home foster dog rescue. The donation made a big difference to them. They were very thankful.
Karen McGuire
Customer Service Manager
2017
Chicago
– My name is Karen McGuire, and I work for Semper CellMark at CellMark’s Recycling division. I do customer service and some inside sales. I’m also the office manager for the Chicago office, responsible for ensuring everything is billed correctly by the end of the month. That’s pretty much my job description. I do just about anything they ask me.
I have been with Semper CellMark for 34 years, and with CellMark since 2017, when they acquired Semper CellMark (at that time Semper Exeter). CellMark has actually been great for us. They’ve treated us well, and we appreciate that. I think we care for each other really well at CellMark, especially in the Chicago office. We’re a close-knit team, always in touch and ready to help, whether it’s work-related or personal.
One thing I truly appreciate about CellMark is CellMark Cares, which allows employees to recommend local charities for company support. When I learned about the initiative, my first thought was: “Oh my gosh, I’ll nominate The Chicagoland Dog Rescue!”. This organization is an all-home foster dog rescue, meaning every dog lives in a loving home rather than in cages or kennels. I actually fostered to adopt a dog about a month ago. It was emotional as it’s easy to get attached, but it’s comforting knowing the dogs are in loving homes.
I follow the rescue online and always find myself looking at new dogs. We recently lost our dog Nala, who was 12, and we haven’t decided whether to get another. Losing a dog is incredibly hard – it felt like losing a child. That’s how I knew about the rescue and why I nominated them.
When the donation came through, the rescue director was skeptical at first, thinking it was a scam. But I reached out, confirmed it was real, and she submitted the application. They were incredibly grateful. They’re a small, home-based rescue, and while they usually get very small donations, the donation from CellMark made a big difference to them.

















