Leadership Team

Harry Lamberton was named President and CEO of Yellowstone Landscape in May of 2023, after joining Yellowstone in January of 2022 as President. As CEO, Harry leads and drives Yellowstone’s strategy, continued growth, quality service, focus on safety, and maintaining a great place to work for all employees, applying expertise gained from over 20 years of leading environmental and sustainability businesses at Waste Management.  Harry continues to be active in broadly supporting sustainability and the environment by serving on the Conference Board’s Global Sustainability Centre’s Advisory Board, the Board of Directors of the Sustainability Institute at the University of New Hampshire and the Board of Directors of Friends of the Chicago River.  Harry holds a BA from the University of New Hampshire and an MBA from the Goizueta School of Business at Emory University.

Tim Portland has served as the Executive Chairman of Yellowstone Landscape since May of 2023. As Executive Chairman he is highly active and engaged within the company, supporting the company’s executive leadership. Prior to his current role, he led the company as CEO for more than a decade. In addition to chairing Yellowstone’s Board of Directors, Tim serves on the Board of Directors of the National Association of Landscape Professionals and chairs the association’s H-2B steering committee. He also serves on the Board of the Seasonal Employment Alliance, an advocacy organization focused on congressional reform of the guest worker visa programs that sustain seasonal businesses across the United States. Prior to joining Yellowstone, Tim was the CEO of United Subcontractors, a leading installer of building products. Over a ten-year period, he was the President of several divisions of Scotts Miracle-Gro, including the Ortho and Roundup brands, Scotts LawnService, and Scott’s International Professional business. He was previously an executive with Scientific-Atlanta (now part of Cisco), and a management consultant with McKinsey and Company. Tim holds an MBA from the University of Virginia’s Darden Business School and an undergraduate degree from Dartmouth College.

Jon Richardson is among the longest-tenured members of the Yellowstone Landscape leadership team and is currently responsible for the company’s operations across the state of Texas and the Southwestern United States. Jon joined the company in 1994 and has held a number of positions of ascending responsibility, including Vice President of Construction for our Texas region, immediately preceding his current role. His deep industry knowledge and experience continue to be demonstrated in his operational teams’ performance and his ability to mentor young and talented Landscape Professionals.

Elise Johnson has led Yellowstone Landscape’s Human Resources team needs since joining the company in 2010. Elise and her team are chiefly responsible for helping our local branch leaders find and recruit the talented and professional managers needed for continued strong growth and consistently excellent quality. She has also developed local support tools and implemented best practices for attracting and retaining frontline personnel, including benefits, rewards, and engagement programs designed to make Yellowstone the best place to work in the landscape industry. She navigates the company’s seasonal operating demands and decentralized business structure while ensuring regulatory compliance within a demanding, performance-driven culture. Elise earned a BA from Dickinson College and her MBA from Rutgers, The State University of New Jersey. Before joining Yellowstone, Elise held similar positions at prominent financial services firms in New York City.

Since joining Yellowstone Landscape in 2018, Gabe Perez has been responsible for the company’s critical technology infrastructure and systems. With a background in programming, quality assurance, and business intelligence, Gabe and his team deliver the most efficient and user-friendly information systems and reporting possible. Leaders at all levels of the company rely on the work of Gabe’s team when making decisions about how to best manage their parts of the business and drive the overall performance of the company. A native of Flagler County, Florida, Gabe completed his Associate’s degree at the University of South Florida before earning his Bachelor of Science in Information Technology and Management at Keiser University in Jacksonville.

Since joining Yellowstone Landscape in 2015, Chris Adornetti has overseen all day-to-day Accounting and Finance operations of the company, including all treasury, insurance, tax, and legal requirements. Prior to joining Yellowstone, Chris spent 7 years at Harte Hanks, a publicly-traded marketing, data analytics, and logistics company, and previously worked in public accounting and internal audit. A two-time graduate of the University of North Florida, Chris holds a Bachelor’s degree in Accounting and a Master’s in Business Administration.

Ben Collinsworth joined the company in 2019 and serves as Director of Advanced Technologies and Sustainability at Yellowstone Landscape. In his role, Ben is focused on expanding and implementing new technologies into the company’s operations. These include both software and systems, tools and capabilities, and leading the testing and field practices for new advances in autonomous and robotic mowing opportunities and battery and electric-powered devices. In May of 2023, Ben’s role expanded to include oversight of the company’s efforts to promote sustainability within our client properties, the company, and the landscape industry. Prior to joining Yellowstone, he founded and managed his own successful commercial landscaping company for more than 20 years, Native Land Design, operating locations in both Austin and Houston, Texas. Ben is a proud graduate of Texas A&M University, where he played defensive end on the A&M football team.

With nearly thirty years of experience in the commercial landscaping industry, Brian Martin has performed several leadership roles for Yellowstone, including prior line management of all of Yellowstone’s Florida operations. To help meet the demands of Yellowstone’s rapid growth, Brian took on leadership of Yellowstone’s Standards, Safety, and Training needs. He is responsible for developing and applying the best practices of the company across varied regions and branch locations while continuing to increase operational efficiency and quality. Through his dedicated Health and Safety team, the company has achieved some of the lowest incident rates in the landscape industry and is routinely recognized for the proactive approach that Yellowstone takes toward safety and protecting its employees, clients, and their properties. Brian personally leads employee training and development for Branch Managers, Account Managers, Irrigators, and other Horticultural Personnel. Brian is a graduate of Virginia Tech’s Landscape Architecture program and holds an MBA from the University of Florida.