About Professional Grounds


Over the past four decades, Professional Grounds has acquired some of the most experienced and qualified professionals in the industry. Quality service and customer-focused thinking have earned us a reputation for excellence. We are confident that when we send a member of our team to a client’s property that they will provide quality service and carry themselves with the highest level of professionalism. Through our two facilities in Lorton and Manassas, our landscape company has served more than 50,000 properties throughout Northern Virginia and Washington, D.C. We employ the strictest level of professional and safety standards in order to provide our clients with the quality service they deserve, and our work is backed by the strongest warranty offered in our area.

Since 1974, Professional Grounds has maintained the highest business credit rating by Dun & Bradstreet, which means our clients are assured that when they contract with our landscape company, we have the necessary resources, equipment and stability to stay on their job from start to finish. Professional Grounds is consistently rated at the top of our competition year after year. We invite you to learn more about our team of highly skilled designers, horticulturists, certified agronomists and landscape professionals, applications techs and administrative staff who set our company apart from the competition. Our bios are listed below for your convenience. After you learn more about us, we welcome the opportunity to learn more about how we can help you achieve your landscape dreams!

Meet the Professional Grounds Team 

As founder and Chief Executive Officer, Bill is still actively involved in the daily operations of Professional Grounds and is vested in its continued success. Also a Navy veteran, he has over 35 years of experience in maintaining commercial and residential landscapes.

William S. Trimmer

    Glenda's business school background and work in high-level business offices give her prime experience to perform day-to-day operations assistance. She's also been the wife of CEO/President Bill Trimmer for over 45 years.

    Glenda Trimmer

    Special Assistant to the President
      Tambria's diverse skill set, attention to detail, and glowing personality make her the perfect Office Manager for Professional Grounds.

      Tambria Gariepy

      Office Manager
        Stephanie brings experience in personnel and clinical case management. She is responsible for operation PGI's Human Resources and Communications departments.

        Stephanie Trimmer

        Human Resources & Communications

          Landscape Design Build Department 

          About Northern Virginia Landscape Company

          Elon University Bachelor of Science-Business Administration

          International Concrete Paver Institute (ICPI)-Level 1 Paver Installer
          Low Voltage Lighting Specialist

          Tim initially joined Professional Grounds in 1996 as a part-time employee and he continued to work summers at the company while obtaining his formal education in business management. Professional Grounds was honored to welcome Tim as a full-time employee in 2003, two days after his college graduation. As the Landscape Director, Tim’s responsibilities include managing and overseeing all aspects of the Landscape Department. Tim plays a key role handling company finances and budgeting, strategic planning, and internal controls. His positive attitude and hard work ethic accompanied with strong leadership skills make Tim a fabulous director. Over the last two decades, Tim has grown with the company and plays an integral role in Professional Grounds success.


          JOSHLandscape Design/Enhancement Manager
          The Pennsylvania State University–Landscape Contracting Design/Build

          Landscape Industry Certified Technician–Exterior (CLT-E)
          International Concrete Paver Institute (ICPI)-Level 1 Paver Installer

          Josh has over 10 years of experience in the landscape industry ranging from production, management, sales, design and installation in both residential and commercial markets. He views himself as an Outdoor Living Consultant and strives to provide the optimal solution for each client based on their lifestyle, preferences and site conditions. His passion is to provide functional living spaces that incorporate the appropriate plantings and hardscapes that will excel in its environment, and allow his clients to enjoy their personalized landscapes for many years to come.

          With his extensive background in production and design along with his passion in this industry, he will help turn your dreams into reality. In his spare time, Josh enjoys spending time in the outdoors hunting, fishing, boating and spending quality time with his wife and two daughters.

          Commercial Maintenance Department

          About Fairfax, VA Landscape Company

          VICTOR Director of Maintenance
          National University of Managua, Nicaragua

          Victor is responsible for the day-to-day operations of the Maintenance Division at our main branch in Lorton. In addition to managing Lorton’s maintenance crews, Victor is in charge of scheduling, training new crew members and quality control. Victor originally started working for Professional Grounds in 1985 as a laborer. Victor’s natural ability as a leader, his attention to detail and his dedication has made him a very important asset to Professional Grounds. The company’s success is directly related to Victor’s role in day-to-day operations. Victor is both passionate and dedicated to providing superior service for our clients.

          About Arlington, VA Landscape Company

          JON Business Development Manager
          Virginia Tech Bachelor of Science-Environment Resource Management
          Master of Science-Turfgrass Management & Agronomy

          Jon’s primary focus is business development which includes everything from customer service to continued, controlled growth of the landscape maintenance division. Jon has been with Professional Grounds, Inc. for over 10 years. Jon acts as community liaison and is involved in community associations such as: CAI, PMA, and AOBA. Jon’s formal education in Turfgrass Management and Agronomy and his previous experience as a Turfgrass Specialist and Branch Manager for lawn care franchise, has proven him to be an expert in the field. Jon is the primary contact for all new and potential landscape maintenance clients and coordinates a smooth transition to a full time Area Manager.

          About Northern Virginia Landscape Company

          VICTOR Jr. Branch Production Manager, Manassas

          Victor Jr. plays an integral part in our company’s overall success. Victor Jr. starting working for Professional Grounds in 2000 as a crew member. Victor showed such strong potential and work ethic that within months of joining Professional Grounds he was promoted to a Foreman and was leading crews. By 2004, Victor’s hard work, determination and strong management skills lead to his promotion as the Branch Production Manager for our Sterling Maintenance facility. Under Victor’s lead, Professional Grounds relocated our Sterling facility to Manassas in 2011. Victor is fully responsible for all safety and training, scheduling, production, quality control and day to day operations out of Manassas, VA.

          About Washington, DC Landscape Company

          ERIK Area Manager
          University of Massachusetts, Stockbridge School of Agriculture

          Pest Applications
          Certified Nutrient Planner

          Erik has over 30 years of turf management experience. After working in New England, the Mid Atlantic and Arizona, Erik has extensive knowledge of both warm and cool season turf. Erik has also managed golf courses and worked closely with members to deliver optimal results and satisfaction. Since 2007, Erik has worked for Professional Grounds as an Area Manager for commercial properties. Erik is also one of few professionals in the area who is certified by the Department of Natural Resources to create Nutrient Management Plans.

          The employees of Professional Grounds take an active role in our community. We each share a passion for making a difference in our community through donations, drives and participating in local community service projects. Take a look at some of our latest community work.