Mark Ledogar

Mark joined One Smooth Stone in 2000, coming over from SmithBucklin, where he was director of the tradeshow division.

Mark’s hands-on approach to strategic and creative message development, pre-event and on-site event production, presenter management and coaching, and team leadership positions make him a highly skilled and invested relationship manager for the variety of clients we serve.

And, in the spirit of giving back, Mark serves as a model for us all. He’s the former president of the Northwestern University Alumni Association and president of Seven Generations Ahead, a non-profit sustainable community organization. Get to know Mark better on LinkedIn.

Mike Fiber

Mike is a 20-year industry veteran with deep experience across the business event management landscape in both the production and operations areas of business events.

Mike has served as an executive team leader of PRA since 2017, leading all business operations, including 28 office locations in North America. He has been instrumental in driving strategic alignment and consistency in PRA’s growth over the last two years.

Prior to joining PRA, Mike served as Vice President of Operations for PSAV Presentation Services, a global provider of event technology services where he developed key strategies and best practices in support of PSAV’s business growth.

Mike earned a BA from the State University of New York at Binghamton.

Gary Vlk

As a founding principal of One Smooth Stone, Gary brings foresight into the changing needs of clients that has allowed the agency to evolve from simply producing meetings to addressing organizations’ marketing challenges and leading them from strategy through execution. Gary is a recipient of an Ex Award from Event Marketing Magazine for best corporate virtual event.

As a musician (yes, he had 80s hair-band hair), Gary is attuned to the rhythms and arrangements inherent in all meetings and events, especially during the planning process. This background gives him the rare ability to lead logistically and technically complex programs, while also remaining a calming influence on those around him. Get to know Gary better on LinkedIn.

Florence Nalepka

As our Vice president of Business Development, Florence joined One Smooth Stone in 2020. A seasoned veteran of the event industry, she comes to us from Northstar Meeting Group, where she was the Global Director of Sales for their sports division.

Florence is always on the go. A mother to 5 kids, when she’s not driving them around to one event or another, she likes to run and do Pilates.

Being in sales is the perfect career for Florence. She’s a born competitor, having been a collegiate swimmer at Arizona State University. Get to know Florence better on LinkedIn.

Steve Koppel

Steve joined One Smooth Stone in 1999, coming over from Edelman Public Relations, where he provided internal communication counsel to Fortune 100 companies.

During his tenure, he’s produced events in more than a dozen countries for organizations big and small. Steve loves the adventure of producing something from scratch. He says every client and every event is unique. “Whether it’s a ballroom filled with thousands of people, or a barrel room filled with wine, I love figuring out what’s possible.”

Steve’s not your typical event producer. His background in public relations and marketing has allowed him to provide value to message development and event communication strategies. Get to know Steve better on LinkedIn.

Ken Haller

Prior to joining One Smooth Stone in 2002, Ken was vice president and director of production for Thinktank, an integrated marketing agency in Chicago. Throughout his nearly 30-year career, Ken has worked in broadcast television and radio, has worked with three presidents and produced and planned events in 30 countries.

A jack of all trades (and a master of a few, too), he possesses expertise that is as diverse as his background: global sales kick-offs, large incentive programs, countless press events, and the Summer Olympics. Today, he focuses his passion on working with clients to solve their communications needs through innovative and integrated event solutions. Ken has a deep footing with most traditional and non-traditional media and enjoys investigating diverse tools and solutions that best fit a client’s objectives. Get to know Ken better on LinkedIn.

Stephanie Selig

With a wide range of event experience, Stephanie has been an invaluable part of our team for more than 20 years. She joined One Smooth Stone right from Columbia College. Growing up here has equipped her with the tools necessary to deliver impact and exceed client expectations.

Stephanie’s ability to easily grasp a project, blend seamlessly into any team, and efficiently multi-task makes her a favorite internally and among our clients. Her positive attitude and effortless flexibility enables her to quickly assess a situation and create powerful solutions in the most stressful environments. And if you ask her, she will tell you the birthday of every person who has ever worked here. Get to know Stephanie better on LinkedIn.

Mike Foust

Event production is in Michael’s DNA. He started at a young age as a runner/PA for the North American International Auto Show in Detroit. Over the years he has been fortunate enough to produce events of all shapes and sizes all over the world using a wide variety of in-person and digital communication strategies and solutions for clients including General Motors, Allstate, AbbVie, Bank of America, Boeing, FedEx and P&G. He also spent some time on the venue-side of the industry booking events at the historic Chicago Theatre. If he’s not at work, he’s most likely on the ice somewhere playing hockey, in his basement studio playing one of his many guitars or chasing down the next piece of gear for his collection.

Malinda Lynch

Malinda has a strong film and production background, as a producer of national television spots as well as live events. She’s also worked at the Sundance and Chicago International Film Festivals. Originally from Arizona, she has called Chicago home since 2004, where she attended Columbia College. When not working, Malinda loves going to the movies (favorite director is Paul Thomas Anderson). She is also a HUGE fan of Chicago’s own Billy Corgan, and calls Muzzle her favorite song. Get to know Malinda better on LinkedIn.

Heather Koepke

Heather comes to us from McDonald’s Creative Services and Events Department, where for 14 years she worked on programs big and small. Her career in event production seemed pre-ordained, as her father also worked in the business for several years. At one point, she thought of becoming a chef, and even when to culinary school for a year. But, alas, the glitz and glamour of our world proved too hard to walk away from. Get to know Heather better on LinkedIn.

Jonathan Williams

Jonathan came to One Smooth Stone from McDonald’s, where he produced events for more than seven years. Jonathan's music and theater background make him a natural in the live event industry. He’s a skilled media producer as well, and if you have any questions about Star Wars, Star Trek or Dr. Who, go no further. Get to know Jonathan better on LinkedIn.

Evelyn Zimmer

Evelyn joins us directly from Concordia University, where she graduated in 2017. Originally from Northern California, she loves exploring her new hometown. She also plays a mean Bassoon, so if you're looking for a Bassoonist to fill out your ensemble, hit her up! Get to know Evelyn better on LinkedIn.