Tree Care Staff

Colton Hansberry

Certified Arborist WI-1297A
TRAQ Certified

I am an ISA certified arborist who has worked in the tree care industry since 2016.  I began my career with a small company outside of Shopiere, WI where I first discovered the fascinating world of tree care. My career then led me to Heartwood Tree Company of Madison, WI where I developed my skills as a climbing arborist, crew leader, and sales representative for nearly 5 years.  I also worked for several years with Mallon Tree Service of Evansville, WI where my relationship with owners Kyle and Emma Mallon began. I started my own company, Hillcrest Tree Care, in 2021.

Merging with Mallon Tree Service

When Mallon Tree Service reached out with a sale proposal in 2022, I felt it would be a great way to further my own company’s growth and align myself with their quality standard of tree care. Read the Mallon’s letter to learn more about the recent ownership transition.

Philosophy

I believe we must be good stewards of the earth we’ve been given, I am committed to providing the best tree care I can. I encourage others to keep their trees whenever possible, rather than having them removed. 

Family

Over and above being a company owner, I am a follower of Jesus Christ, as well as a husband and a father.  My wife, Taylor, and I married in 2015, and we have four children together. We were both born and raised in Rock County (Taylor is from Clinton and I grew up in Beloit). 

As a family we enjoy bike riding, four wheeling, and going for walks around our small hobby farm. I have always had a love for the outdoors, which began as a small child when I would spend time hunting, camping, and fishing with my father and grandfathers. 

Arron Pratt

Certified Arborist WI-1530A
TRAQ Certified

My career in tree care began in 2017 with Mallon Tree Service, where my friendship with Colton initially began. I strengthened my climbing and overall tree care experience with Heartwood Tree Care through 2021. After journeying outside of tree work for a short period of time, I made my way back into the industry alongside Hillcrest Tree Care.

First and foremost, I am a follower of Jesus Christ, as well as a husband and father of four children. Together, we own an organic farm where we raise beef, pork, and chicken. I enjoy hunting, foraging, teaching my children new things, and spending as much time outdoors as possible. My love for the outdoors stems from being a young child, spending as much time on my family farm as possible. Nature, trees, and wildlife have always been admirable to me, and I am fortunate enough to spend most of my time surrounded by the beauty of God’s creation.

Matt Duffy

Certified Arborist WI-0777A
TRAQ Certified
Commercial Pesticide: 515300

My story with arboriculture begins in 2007 after graduating from UW-Madison.  Trees and caring for them have long been my passion and the idea of getting to climb them as a job too exciting to pass up.  I worked for a few Dane County companies for several years learning the ropes of the industry and working with many talented arborists that were crucial in developing my skills and knowledge as an arborist.

I left Wisconsin in 2010 and embarked on a journey working and traveling across the country for about 9 years.  During that time I worked as an arborist for Davey Tree in both Fort Collins, Colorado and Boston, Massachusetts.  Felled hazard trees for the National Park Service in Grand Canyon and Sequoia National Parks.  Performed short grass prairie restoration for the U.S. Fish & Wildlife Service in Denver and controlled invasive plants at Great Smoky Mountains National Park, Tennessee and Lake Mead National Recreation Area, Nevada.

I’m happy to be joining Hillcrest where I know that caring for the trees and the people we serve is deeply rooted in the philosophy of the company.  As my career has developed my focus has steered towards plant health care, insect and disease diagnosis, tree risk assessment, planting, ornamental tree and shrub pruning and outreach and education.

Currently, I live in Madison with my wife and daughters and we enjoy getting outside to explore nature whenever we can and tending our gardens at home.  In my spare time I’m the caretaker of my church’s property in Cottage Grove where for the past 8 years I’ve been working on creating an arboretum as a way to give back to the church, the community and to nature.

Zack Wiest

Certified Arborist WI-1577A
TRAQ Certified

I am a proud follower of Jesus Christ! I love my wife and my three kids. I was in the fitness industry for a few years after college, but fell out of it in 2017. By God's hand I landed my first tree job in Madison in 2018 and have been in the industry ever since. I love to work with my hands, I love the outdoors, and I love to climb trees!

In my free time I can be found listening to a sermon, hunting, fishing, camping, or wrestling and jamming to favorite tunes with my boys. In tree care, no two jobs are the same so I'm constantly being challenged and there is always something new to learn. I'm passionate about the preservation and conservation of trees, specifically planting and properly maintaining young trees.

Nathan Anderson

I started working in lawncare and landscaping at twelve years old and have always enjoyed being outside. After high school, I worked in taxidermy and at a medical parts company, both of which provided great learning experiences and challenges – and also made me realize I missed being outdoors.

When Colton approached me about the possibility of working with him, I was excited about the idea; I joined the team in February 2023. This has been a wonderful work experience and I love facing all the new challenges that arise. I have grown to see this opportunity for what it is: a way to serve my Lord and Savior Jesus Christ, a way to serve my fellow Hillcrest co-workers, and a way to serve my community and friends. I am excited for the upcoming years and memories!

Outside of work, I enjoy playing the guitar, reading, and woodworking.

Aaron Hatlevig

I started working with the Hillcrest team in the tree service industry in April 2024. They welcomed me with open arms and teach me something new every day.

Before Hillcrest, I worked various jobs in the trades, including electrical work, well pump installation, and concrete. Growing up hunting and fishing has shaped my love for the outdoors. In my spare time I play home talent baseball, softball, fish, and enjoy time with my loved ones. I am excited to further my knowledge in arboriculture as a member of Hillcrest.

Able Milligan

Bio coming soon.

Office Staff

Abraham Rolsma

I have worked in landscaping, groundskeeping, and lawn care on and off for around a decade. This varied outdoor work has instilled in me a love for the outdoors. Prior to joining the Hillcrest team, I worked in an industrial setting and began longing to work outdoors again. I am excited to now work at Hillcrest Tree Care as the office manager. I take care of administrative needs while also getting outdoors and occasionally working with the crew. I anticipate growing with the company for years to come. Through my position, I am blessed to be able to serve my Lord Jesus Christ and provide for my family. Outside of work, I enjoy spending time with my beloved wife, Kaelyn, road biking, and kayaking.

Andrea Pratt

I joined Hillcrest Tree Care in a part-time role after stepping away from a career in the medical field. This transition was a deliberate choice to slow down and spend more meaningful time with my young children. While my primary focus is serving God and caring for my family as a stay-at-home mother, I’m grateful for the opportunity to support the Hillcrest team through behind-the-scenes projects that help improve efficiency and organization.

My greatest joy is raising my four children alongside my husband, Arron. Watching each of them grow and discover new things each day is both beautiful and deeply rewarding. As a family, we love spending time together on our farm—whether it’s going on four-wheeler rides or enjoying peaceful trips to the creek. I find true fulfillment in homemaking and take pride in turning the same farm I grew up on into a warm and loving home for my own family. 

Michelle Wiest

I joined the Hillcrest team in June 2026 after nine years of teaching math for UW-Platteville. You can find me posting to social media, writing quarterly newsletters, and managing website updates. I am grateful to be working a lower stress job while I stay home full time and homeschool our three children, and I thoroughly enjoy being a part of the Hillcrest team and working with a great group of people.

I enjoy painting with watercolors, reading, knitting, crocheting, gardening, hiking, spending time with friends, and fishing with my family. During the day, you’ll find me cooking, taking trips to various libraries, watching my kids as they play, and walking my dog. I am a follower of Christ, and I strive to let His light and love shine through my words and actions every day.