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Meet the team
Here are some of the friendly faces dedicated to helping you get the most out of your operation.
Stephen Pistoresi
Smartfield Go-to-Market Lead, North America
Stephen Pistoresi
Smartfield Go-to-Market Lead, North America
About
Stephen Pistoresi is the Smartfield Go-to-Market Lead, North America, and brings extensive experience advancing innovative technologies across multiple industries. Born and raised in Fresno, California, he has a strong personal connection to the farming community and the challenges growers face. Stephen works closely with retail and distribution partners across North America while building relationships with emerging agricultural enterprises. His focus is on supporting growers with the tools, partnerships, and technologies they need to operate more profitably, resiliently, and sustainably.
Mando Perez
Director of Sales, Smartfield
Mando Perez
Director of Sales, Smartfield
About
Mando Perez is the Director of Sales at Semios, bringing more than a decade of experience working with growers, advisors, and industry partners to deliver practical, effective solutions to the field. A licensed Pest Control Adviser (PCA), Mando has supported growers in managing pest pressures and making strategic, long-term decisions for their operations. He also serves as President of the Kern County California Association of Pest Control Advisers (CAPCA) and is actively involved in several agricultural boards, staying closely connected to the needs of the industry.
Justin Pearson
Washington Territory Manager
Justin Pearson
Washington Territory Manager
About
Justin is the Territory Manager for Washington, bringing deep roots in the Wenatchee Valley. From swamping cherries as a teen to doing pest control in friends' and family orchards, Justin has always been closely tied to agriculture. Over the past six years, he has built and managed Semios operations in the area, working closely with growers to support their success. When he's not in the field, he's outdoors—fishing, hunting, or camping with his family. Justin is also a passionate conservationist, and he brings that same care and commitment to every grower he works with.
Jeff Thorning
Stanislaus & San Joaquin Counties, California Territory Manager
Jeff Thorning
Stanislaus & San Joaquin Counties, California Territory Manager
About
Jeff is the Territory Manager for Stanislaus and San Joaquin Counties, California. He brings more than 18 years of experience in agricultural equipment sales and support, working with growers across six continents. Jeff specializes in helping customers get the most out of their irrigation systems and technology investments, offering practical, field-tested solutions that improve efficiency and on-farm decision making.
Ashlee DeSilva
Fresno County, California Territory Manager
Ashlee DeSilva
Fresno County, California Territory Manager
About
Ashlee DeSilva is the Territory Manager for Fresno County, California. She is a licensed Pest Control Adviser (PCA) with a background in agricultural research. She began her career in entomology research with the USDA before moving into hands-on roles managing large almond and pistachio territories. Ashlee brings a strong curiosity for understanding the “why” behind field decisions, combining research expertise with practical experience to help growers address pest challenges and make effective management decisions.
Sydnee Whitehead
Kings & Tulare Counties, California Territory Manager
Sydnee Whitehead
Kings & Tulare Counties, California Territory Manager
About
Sydnee is the Territory Manager for Kings & Tulare Counties, California. Since 2020, she has supported growers with technical expertise in water and pest management, working closely with them to better understand and implement impactful tools and solutions. Sydnee focuses on providing practical guidance and product insights that help growers improve efficiency and support the long-term sustainability of their operations.
Dominic Fanucchi
Southern California Territory Manager
Dominic Fanucchi
Southern California Territory Manager
About
Dominic Fanucchi grew up in Bakersfield, CA, in a pistachio farming family, and got his start working in the fields during summers in high school. Dominic later earned his Associate's degree in Plant Science and went on to work in the farm management business, gaining hands-on experience from the top to the bottom of the operation. Dominic brings a combination of practical, in-field experience and technical knowledge, and he's looking forward to working with you to find the right solutions to drive better outcomes in your fields.
Geo Salazar
Grower Relation Specialist
Geo Salazar
Grower Relation Specialist
About
Geo is an experienced agriculture professional with more than a decade of industry experience, specializing in pest management and production agriculture. A graduate of Butte College and a licensed Pest Control Adviser (PCA), he brings a strong practical understanding of the pest management challenges that growers and advisors face every day. His expertise spans pest control strategies as well as broader farm management practices, allowing him to support growers with holistic approaches to optimizing crop health and mitigating pest pressures.
Jose Garcia
Grower Relations Specialist
Jose Garcia
Grower Relations Specialist
About
With over ten years of experience in the tree fruit industry, Jose holds a B.S. in Integrated Plant Science with a focus on Fruit and Vegetable Management, as well as a minor in Horticulture and an Organic Ag Certificate from WSU. Jose's expertise in Water & Agronomy makes him a valuable resource for optimizing water use and crop health.
Ignacio Valdez
Grower Relations Specialist
Ignacio Valdez
Grower Relations Specialist
About
Based in Fresno, Ignacio Valdez is a Grower Relations Specialist at Semios. As a licensed Pest Control Adviser (PCA) holding a Bachelor’s in Plant Sciences from Fresno State, he brings extensive technical and field knowledge, drawing from his experience working as a field scout, supporting grower mating disruption programs across California, and conducting entomology research with the UC Cooperative Extension. Ignacio is dedicated to helping growers find the right solutions for their operations and being a trusted expert that they can count on.
John Weesner
Irrigation Specialist
John Weesner
Irrigation Specialist
About
John Weesner is an Irrigation Specialist at Semios, helping growers optimize water management and get the most out of their irrigation technology investment. John holds a certification in Irrigation Systems Evaluation (Distribution Uniformity) from the Irrigation Training and Research Center of Cal Poly SLO. He's continuing his work in ag in honor of his grandfather, George V. Ferry, a longtime UC Cooperative Extension Farm Advisor. Drawing on 15 years of customer service and sales management experience prior to Semios, alongside over six years of technical irrigation and customer support within the company, he brings a strong mix of ag experience and technical expertise.