Meet the Crew
Derek Earnst, Owner & Professional Contractor
With more than 15 years of experience in residential and commercial plumbing and over a decade in residential construction, Derek brings a unique combination of technical expertise, hands-on craftsmanship, and a passion for building something that lasts to every Cornerstone Remodeling project.
Derek’s career in the trades began shortly after high school when he started as a plumbing apprentice. He worked his way through the plumbing field, gaining valuable experience in both residential and commercial applications while developing a strong understanding of how homes and building systems work from the inside out. His experience eventually expanded into residential construction, where he discovered a passion for bringing entire projects together—not just one trade at a time.
After years of learning the industry and working alongside a small local construction company, Derek took a leap in the spring of 2019 and opened his own business. That decision became the foundation for what would ultimately grow into Cornerstone Remodeling.
Today, Derek is involved in virtually every aspect of a project. While he still puts his hands-on skills to work in the field, he also plays a major role in planning, design, material selection, problem-solving, and project execution. He works closely with homeowners from the earliest conversations through the final details, making sure the finished product reflects both their vision and the high standards Cornerstone is known for.
One of Derek’s favorite parts of the job is sitting down with clients and talking through what is possible. He enjoys taking an initial idea and helping homeowners see beyond what currently exists in their home. Whether it’s a kitchen transformation, a bathroom renovation, a finished basement, or a larger-scale remodel, Derek loves finding creative and practical ways to make the most of a space.
Derek and his wife, Allison, make a true “dream team” at Cornerstone. Derek brings extensive construction knowledge, technical expertise, and years of experience in the trades, while Allison brings her design eye, creativity, communication skills, and experience in the remodeling industry. Together, they work closely with clients to blend functionality, craftsmanship, and beautiful design into every project.
Derek is also Schluter certified, adding specialized expertise in waterproofing and tile installation systems. He takes pride in understanding not only how something should look when it’s finished, but also what needs to happen behind the walls and beneath the surfaces to ensure it is built correctly and designed to stand the test of time.
For Derek, the most rewarding projects are the ones he can see through from beginning to end—from the first conversation and initial design, through demolition and construction, all the way to the final finishing touches. He loves watching an idea become a real, finished space and knowing that every detail was carefully considered and executed.
When he’s not working, Derek enjoys spending time with his family, watching football, getting outside, and going on dinner dates with Allison. Whether he’s building something at work, spending time with his family, or simply enjoying the outdoors, Derek brings the same values to everything he does: hard work, attention to detail, integrity, and a commitment to doing things the right way.
For Derek, remodeling isn’t simply about changing a house—it’s about helping people create a home they’re excited to live in for years to come.
Allison Earnst, Co-Owner & Business Director
Allison earned a Bachelor of Communication Sciences degree with Summa Cum Laude Honors from West Virginia University, bringing a strong background in communication, creativity, and organization to her role at Cornerstone Remodeling. She also serves on South Middleton Township’s Zoning Hearing Board, giving her an additional perspective on the community and the importance of thoughtful planning.
As the driving force behind many of Cornerstone’s day-to-day operations, Allison coordinates business operations, oversees the company’s marketing, helps keep projects and communications moving smoothly, and works closely with clients throughout their remodeling journey. She wears many hats—but her passion for people, design, and creating a great client experience is at the heart of everything she does.
As Cornerstone’s Marketing Director, Allison works to tell the Cornerstone story and showcase what makes the company unique. From developing the company’s brand and online presence to creating engaging content, highlighting completed projects, connecting with homeowners, and sharing the craftsmanship behind each renovation, she loves finding creative ways to communicate what Cornerstone is all about. She believes great marketing is more than simply promoting a business—it’s about building relationships, sharing real stories, and helping homeowners feel confident about the team they choose for their home.
Allison also assists clients with the design and planning of their projects. She has a natural eye for design and loves helping homeowners take their ideas, inspiration, and wish lists and turn them into a cohesive vision. She especially enjoys the details—from finishes and colors to layouts and the little touches that make a space feel uniquely theirs.
Together, Allison and Derek truly are a “dream team.” Derek brings years of professional construction knowledge and hands-on remodeling experience, while Allison brings her eye for design, communication skills, creativity, and experience in the remodeling industry. Their combined strengths allow them to approach projects from both the construction and design perspectives, helping bring each homeowner’s vision to life.
For Allison, one of the most rewarding parts of her work is seeing everything come together—the plans, the design, the craftsmanship, and ultimately the finished space. There’s nothing quite like seeing a homeowner’s excitement when they walk into a completed room that looks and feels exactly the way they imagined.
When she’s not making Cornerstone run smoothly, Allison loves spending quality time with her family and hosting gatherings with friends. And when she’s not working or playing with her kids, there’s a good chance you’ll find her in the kitchen cooking something delicious!
For Allison, Cornerstone is about more than remodeling homes. It’s about creating an experience homeowners can feel good about, building relationships along the way, and helping turn the places people live into the spaces they’ve always dreamed of.
Loren Jones, Project Manager & Professional Contractor
With more than 12 years of experience in the construction industry, Loren brings a broad range of hands-on skills, strong leadership, and a natural ability to solve problems to the Cornerstone Remodeling team. From building fences and installing pools to constructing steel free-span horse areas and completing residential renovations, Loren’s experience has given him a unique understanding of construction from the ground up.
Loren’s introduction to the trades started at an early age, when he would go to work with his dad and learn firsthand what it means to work hard, pay attention to the details, and take pride in a job well done. Those early experiences laid the foundation for a career that has continued to grow and evolve.
Over the past eight years, Loren has focused primarily on residential remodeling, developing extensive experience in framing, drywall, roofing, siding, trim work, and overall project construction. He has also gained valuable experience leading teams on job sites and helping manage projects, making him an important part of keeping Cornerstone projects organized, efficient, and moving forward.
One of Loren’s greatest strengths is his ability to see a challenge and figure out a solution. Remodeling rarely goes exactly according to plan, and Loren enjoys the problem-solving side of construction—finding practical solutions while maintaining the quality and vision of the project. His calm approach, willingness to learn, and attention to detail make him someone the team and our clients can rely on.
Loren is also committed to continually expanding his knowledge. He loves learning new things and is currently developing his skills in electrical and plumbing. His desire to understand more areas of the trades allows him to become an even more well-rounded builder and gives him additional tools to help solve challenges that come up throughout a project.
At Cornerstone, Loren works closely with Derek on project planning, helping ensure that the details are thought through before the work begins and that the crew has what they need to deliver a high-quality finished product. He also places a high value on communication with homeowners. We appreciate the way he keeps clients informed, listens to their questions and concerns, and helps them feel confident throughout the remodeling process.
For Loren, a successful project is about more than getting the job done. It’s about building trust with the homeowner, supporting the crew, solving problems along the way, and making sure the final result meets the high standards Cornerstone strives for on every project.
Outside of work, Loren’s greatest priority is his family. He loves spending time with his wife, Chelsea, and their two boys, Lucas and Jackson. His faith is also an important part of his life, and he is a faithful servant to his church. When he has time away from work and family, Loren enjoys running, hunting, and fishing.
Loren brings a combination of experience, humility, leadership, and a genuine desire to keep learning to everything he does. Whether he’s leading a crew, solving a construction challenge, talking with a homeowner, or working alongside the Cornerstone team, he is committed to helping create spaces that are built with care and craftsmanship from start to finish.
Will Sibley, Project Lead
With more than 27 years in the remodeling industry, Will brings decades of experience, a passion for craftsmanship, and a genuine love for seeing a project come together from start to finish.
​Whether he’s framing a new space, tackling the details of a kitchen or bathroom renovation, or transforming a basement, Will enjoys every stage of the process. But there’s something especially satisfying about those final finishing touches—the details that turn a construction project into a finished home. For Will, few things compare to seeing the “before” and “after” and watching a homeowner’s vision become a reality.
​What he loves most about working at Cornerstone is the people. He’s proud to be part of a dedicated team that cares about doing things the right way and works together to complete each project on time and as efficiently as possible. It’s that shared commitment to excellence that makes Cornerstone feel like more than just a workplace.
​Outside of remodeling, Will’s life looks a little different than it did growing up in the city of Philadelphia. Today, he calls Newville, Pennsylvania, home, where he enjoys life in the country with his wife, Jocelyn, and their three children, Andrew, Maria, and Shane. The family also shares their farm with cats, goats, chickens, and turkeys.
When he’s not working, you’ll likely find Will working on the farm with his family, enjoying woodworking, camping, fishing, hiking, or firing up for a good BBQ. His faith in God and his family are at the heart of everything he does.
​From Philadelphia city life to Pennsylvania farm country, Will has built a life centered around family, faith, hard work, and craftsmanship—and he brings those same values to every Cor
Tom Stone, Contractor
Tom brings a strong work ethic, hands-on experience, and a genuine passion for remodeling to the Cornerstone crew. He spent eight years working as a laborer for his dad’s remodeling company before joining Cornerstone Remodeling, where he has spent the past two years continuing to grow his skills and craft.
​Tom especially enjoys painting and watching a project transform as each stage comes together. He loves taking a dark, unfinished basement and turning it into a bright, welcoming space where families can make memories. One of his favorite parts of the job is seeing the homeowner’s excitement as their vision becomes a reality.
What Tom appreciates most about Cornerstone is the way the crew looks out for one another while taking great pride in their craftsmanship. He brings 100% effort to every project and is always looking for ways to improve and learn.
​Originally from Connecticut, Tom spent 7½ years living in Washington State before moving to Pennsylvania, where he has lived for the past three years. Outside of work, he enjoys spending time with his wife, Rebecca, their son, Thomas, and their dog, Daphne. He’s also a big fan of both ice and roller hockey.
Tom brings some unique skills to the Cornerstone team as well. He went to school for auto repair and is an aluminum welder—skills that add another level of hands-on problem-solving to his remodeling experience.
​For Tom, remodeling is about more than just building or updating a space. It’s about putting in the effort, developing his skills, working alongside a great team, and helping create spaces where families can enjoy life together.
Aedin Mill, Contractor
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With four years of experience in the remodeling industry, Aedin takes pride in working hard and seeing the results of that dedication come to life. One of his favorite parts of the job is watching a project transform from start to finish, knowing that the team's effort has created something lasting for each homeowner.
​Aedin especially enjoys working on home additions because they allow him to spend more time on exterior construction while helping families expand and improve their homes.
​What stands out most to Aedin about Cornerstone is the company's strong work ethic, integrity, and commitment to maintaining a clean and organized job site. His faith is also a driving force in his work, and he strives to honor God in everything he does, living out the principle of "So whether you eat or drink or whatever you do, do it all for the glory of God." (1 Corinthians 10:31)
​Originally from Newberrytown, Aedin moved to Mechanicsburg at the age of 10. Outside of work, he enjoys hunting, fishing, playing guitar, spending time with his fiancée and friends, and leading a preteen ministry at his church.
Chelsea Jones, Office Manager
At Cornerstone Remodeling, Chelsea is the steady hand behind our operations—keeping things running efficiently and ensuring the numbers add up. As our Office Manager, she brings structure, clarity, and a deep understanding of what it takes to keep a remodeling business moving forward.
​Chelsea’s career began in the tax software world, where she supported small businesses in navigating complex systems and streamlining their workflows. That foundation set her up for success when she transitioned into the remodeling industry, taking on the role of Office Manager and quickly becoming the go-to person for all things organization, finance, and administration.
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What sets Chelsea apart is her ability to bring order to chaos. Whether it's budgeting, scheduling, or fine-tuning internal processes, she thrives on making complex systems simple and understandable—for the team and our clients alike.
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Outside the office, Chelsea leads an active life. She coaches and trains at Trinity Fitness, loves hiking in the mountains, and often gets lost in a good book by the lake. A passionate supporter of her family’s athletic pursuits, she’s either mat-side cheering on her boys at wrestling tournaments or crewing for her husband during his ultramarathons.
Lindsay Rathbun, Architectural Designer
Lindsay, an Architectural Designer at Cornerstone, brings clarity, creativity, and purpose to every project. For Lindsay, a successful renovation isn’t just about a fresh coat of paint; it’s about unlocking the hidden potential of a home through creative problem-solving and a sharp eye for detail. Whether she is working with a blank canvas or navigating the quirks of a challenging older home, she approaches every project with the goal of creating a space that is as functional as it is beautiful.
Lindsay’s passion for design started long before her professional career. Growing up working on her family’s residential rental properties and flipping houses, she was introduced to the “bones” of a home at a young age. This early hands-on experience taught her how to think outside the box, especially when dealing with less-than-ideal conditions. Today, that background allows her to see beyond the surface, ensuring every mechanical and electrical element is perfectly aligned with the final aesthetic. From the exact placement of cabinetry to the flow of a room, she believes every design choice should be intentional—rarely is anything left to “just because.”
She understands that the renovation process can be overwhelming for homeowners, often leaving them feeling stuck between too many decisions or left out of the loop. Lindsay prides herself on being the bridge across that gap. By utilizing advanced design software and providing clear visual guidance, she empowers her clients to make educated decisions. She loves explaining the “why” behind a layout, turning a stressful process into an exciting journey where the homeowner feels truly heard and involved.
When she isn’t creating the perfect design or on a job site, Lindsay is likely leaning into her favorite roles: wife and mother of three. Her personal life is just as vibrant as her professional one—during the summer, you’ll find her family camping or riding four-wheelers at their farm. Most spring and fall evenings, she is in her favorite spot on the sidelines, cheering on her sons at the baseball field.
Allison Stine, Finance & Benefits Coordinator
Allison earned a Bachelor of Science in Life Science from Penn State University and a Masters of Science in Community Counseling from Shippensburg University, after which time she had the privilege of staying home to raise her two children. During 9 of those years she co-owned a small, local construction company, where she was primarily responsible for coordinating administrative responsibilities. Currently, Allison is beginning her 5th year as the Administrative Assistant at a local private Christian school but continues to stay connected to the residential construction industry, assisting the Earnsts through her previous experience in the field. She assists part-time with bookkeeping, managing finances, invoicing, payroll and provides other administrative support as needed.
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Allison enjoys hanging out with her teenage son, playing with her chocolate labradoodle, Gus, and loves any time she can get together with family and friends!
