Our Team

Jeff Luzar - Vice President of Sales

Jeff Luzar joined the GuardTop team in 2010 as a Sales and Marketing Manager and has been in the sealcoat business since 1992. Luzar oversees all GuardTop locations including Southern California, Arizona and Georgia, as well as working with production and plant sites to manage product quality and performance. In his free time, you can find Jeff at a Ducks game or cheering on his hometown favorites the Cleveland Browns and Indians.

Brian Barnum - Vice President- Southwest Region

Brian Barnum joined the GuardTop team in 2018 as the Vice President- Southwest Region. He brings over 18 years of experience in the asphalt maintenance industry as both a supplier and contractor and is a board member of Arizona Maintenance Supervisors Association. As the Vice President, he is responsible for business development related to both private and public agencies, as well as being a skilled sales manager, technical support advisor and estimating professional in the industry. The Ohio native can be found spending time with his wife and two daughters cheering on Ohio State, the Cavs, Indians and Browns in his free time.

Davis Koleas - Sustainability Projects Manager

Davis Koleas joined GuardTop in 2016 as the Sales and Marketing Manager for Southern California. After working for FOX Sports as a marketing and content specialist, Davis brought his extensive marketing and communications skills to GuardTop where he manages the Los Angeles, San Diego and Orange County divisions. When Davis is not working, he spends his time on the golf course or at Lakers, Rams and Angels games.

Ryan Strzalka - Sales & Marketing Manager

Ryan joined GuardTop in 2021 as the Sales and Marketing Manager. Previously Ryan has served as National Business Development Manager at SealMaster and Account Executive at Rose Paving LLC. At Rose Paving, he increased his knowledge of the asphalt and concrete industry, produced scopes of work, worked directly with property management and community management companies with their asphalt and concrete maintenance need and was part of many local organizations including BOMA-OC and CAI-OC. In his free time, he enjoys cheering on the Ohio State Buckeyes and the Cleveland Browns, Indians, and Cavs.

Thomas Mucenski - Operations Manager Southwest

Thomas Mucenski joined GuardTop in 2017 and is responsible the daily operations of the Phoenix plant. Thomas has eight years of sales and customer service experience in the Tucson area and has expanded his talents into Phoenix where he handles logistics and operations, including product development and shipping. Thomas is a recent graduate of the University of Arizona and is a dedicated Wildcats fan.

Natasha Koleas - Communications

Natasha Koleas joined the GuardTop team in 2017 leading the communications department. After spending several years working at PR agencies, she brings various communications, event planning and marketing skills to the company. In her spare time, she enjoys exploring California’s beaches and hiking trails while cheering on the Red Sox and Patriots.

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