Austin Hausmann

Chief Technology Officer

Austin Hausmann is a seasoned technology leader with a background in renewable energy and a passion for building systems that scale. At Holganix, he oversees data infrastructure and product innovation, aligning technology with the company’s regenerative mission. Known for his clarity in technical communication and ability to bridge engineering and business, Austin has led successful efforts in team building, product design, and go-to-market development. He's the type of CTO who can discuss machine learning architecture and tree planting strategies in the same breath.

Barrett Ersek

Founder & CEO

Barrett Ersek is a serial entrepreneur in the lawn and landscape industry and the founder of Holganix. With a deep commitment to soil health and a vision for regenerative agriculture, Barrett has been a driving force in creating biologically based solutions that are good for growers, the planet, and the bottom line. He’s an expert on innovation and leadership—his work has been featured in Harvard Business Review—and holds three patents. When not working, Barrett is known for spinning a great story, sharing his latest read, or quoting philosophers with surprising relevance.

Bryan Hansel

Chief Revenue Officer

Bryan Hansel is a growth-focused executive with over 30 years of experience bringing disruptive technologies to market across the product development, medical, electronic, and automotive sectors. Most recently, he led efforts in commercial electric vehicle adoption. At Holganix, Bryan heads up revenue strategy, channel development, and field operations—helping soil reps and growers alike drive success. He’s a strong believer in performance rooted in purpose and leads with contagious energy. Off the clock, Bryan's favorite fuel is probably a high-speed trail run or a post-field coffee.

David Stark, Ph.D.

President Holganix Agriculture

Dr. David Stark brings more than 25 years of experience from Monsanto, where he served in executive roles including VP of Global Trade Partnership, VP of Consumer Traits, and Co-President of NatureMark Potatoes. A molecular biologist by training, he holds nine patents and has authored 26 scientific papers. At Holganix, David brings scientific rigor and market insight to the company’s soil health initiatives. He’s known for combining academic excellence with a grounded, farmer-first approach—and for being just as comfortable talking genetic pathways as he is planting potatoes.

George Mazzella

Executive VP of HGX Global Commercial

George Mazzella is a climate-focused entrepreneur with a global track record—generating more than $400 million in investment for scaling carbon projects across 10+ countries. At Holganix, he leads commercial strategy for HGX, turning agriculture into a climate solution while delivering measurable outcomes for growers and the planet. His work bridges markets and mission, with deep experience in carbon finance, project origination, and boots-on-the-ground execution. If you catch George outside of work hours, he's probably nose-deep in a geopolitical biography or perfecting a risotto.

Kaitlyn Ersek

Chief of Staff

As Chief of Staff, Kaitlyn leads strategic initiatives across the executive team—connecting vision to execution and ensuring momentum behind high-impact projects. With a background in communications and marketing and an MBA to back it up, Kaitlyn brings clarity, structure, and thoughtful problem-solving to every corner of the organization. Outside the office, Kaitlyn recharges in nature—hiking, camping, gardening—and always with a mug of tea and a good book nearby.

Radhika Moolgavkar

VP of HGX Product

Radhika Moolgavkar is a soil carbon expert with over six years of experience in sustainability, including four focused specifically on soil carbon credits. At Holganix, she leads product strategy for HGX with a mission to help farmers improve soil health through solutions that are scalable, profitable, and environmentally sound. Radhika brings a systems-thinking approach to climate and agriculture and has a soft spot for farmers who "get a kick out of regenerative data." Off the field, she’s known for her love of long hikes and strong espresso.

Rob McCoy

Chief Operating Officer

Rob McCoy brings more than 20 years of experience in the green industry, with a track record of building and selling two successful companies. At Holganix, he serves Chief Operating Officer and Executive Vice President of Commercialization for Holganix Ag, where he leads go-to-market execution, operational strategy, and team performance. A competitor at heart, Rob thrives on turning big ideas into operational wins—and if there's tailgating involved, he’ll rearrange his calendar.

Tim Weaver

Chief Strategy Officer

Tim Weaver has helped drive more than $900 million in incentives for sustainable markets and overseen over $2 billion in economic development initiatives across North America and Europe. At Holganix, he orchestrates corporate strategy to scale regenerative agriculture in ways that align impact with innovation. A strategic builder at heart, Tim thrives at the intersection of business development, public-private partnership, and long-term value creation. He also holds the unofficial office title of “most likely to open a meeting with a one-liner.”