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Meet the Experts

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Introducing…our team!

If we had to describe our team in a word…we couldn’t do it! Grounded in years of experience, our team members work with confidence and are invested in our mission to provide high quality products and service to the community.

Whether wielding a hammer, analyzing our accounts, or working directly with you, our clients, our team is made up of passionate people! From avid fishermen, sport aficionados, to plant enthusiasts, we appreciate the unique strengths (and personalities) each brings to the table. We’re more than a team, we’re a family!

Our Office Staff

Kerwin Mast

Owner / Visionary

Kerwin Mast is the owner of Mast Roofing & Construction, Inc. He was born and raised in the Oley Valley and being the son of a farmer, he knows full well what hard work looks like. As a boy, he helped around the farm and worked for neighboring farmers. After high school, he went to Penn State and graduated with a bachelor’s degree in Electrical Engineering.  His remarkable work ethic and attention to detail make him well-suited to be a business owner. He currently works as the General Manager and Visionary of the company, leading the way for the future. He enjoys flying, playing cards, volleyball, hunting, and teaching his children about the world around them. He and his wife, Corrie, live in Berks County with their three children.

Ron Mossie

General Manager

Ron joined the Mast Roofing and Construction, Inc. team in late 2020. He grew up in Oaks and Boyertown, PA, graduating from Boyertown High School. He has a Business Management degree from Kutztown University and since then gained 15 years of management experience, including owning his own business. Here at Mast Roofing and Construction, Inc. he serves as General Manager, making sure all our clients have a fantastic experience from when the contract is signed until the final inspection. He is married to his wife Ashley and the father of four daughters. When not working, he enjoys reading, serving at his church, and running/working out.

Derek Campbell

Sales Manager

Derek serves as our Sales Manager here at Mast Roofing & Construction. At 13 years old, he moved from Pasadena, CA to Exeter, PA, and also graduated from Exeter High School. Derek is a very hard working, self-driven people person, all qualities that make him a great leader. In his free time, Derek enjoys spending time with his wife and two kids, photography, golf, travel, and eating good food!

Ashley Mossie

Office Manager

Ashley is the Office Manager here at Mast Roofing & ConstructionFrom taking care of all things HR, to reconciling financial statements, and everything in between, she makes sure the office runs smoothly. Ashley grew up in Oley and graduated from Oley HSShe holds a Business Management Degree from Kutztown University and has 14 years of banking and finance experience. When not keeping a million numbers straight here at the office, she enjoys cooking and spending time with her husband Ron and 4 daughters.

Corrie Mast

Chief Financial Officer

Corrie Mast wears many hats at Mast Roofing & Construction – when we come up with a title, we’ll let you know! She graduated from Berks Christian School, in Birdsboro, PA, where she met Kerwin at age 15. They were high school sweethearts, and after two years at Elizabethtown College, they got married and she transferred to Penn State to finish her Bachelor’s Degree in Music. Corrie has been working in the office at Mast Roofing & Construction, Inc. since Kerwin first went full time – for the first seven years as the only one in the office. More recently, with the addition of more office personnel, she has transitioned to part-time. She enjoys cooking, hiking, water skiing, target shooting, and spending time with her three children.  

Kerri Fisher

Client Care Representative

From the first call to the completion of a job, Kerri is there to ensure that the entire process goes smoothly. She joined the Mast team as a Client Care Representative (CCR) in early 2018. She grew up in a military family – born in North Carolina, but lived all over the East Coast in her early years. She has been in the customer service/administrative field for her entire professional career and it shows!  She has a genuine concern for client needs and has an uncanny ability to connect with people over the phone. When Kerri’s not manning the phones, she enjoys camping, fishing, snowmobiling, going to the beach, and spending time with her boys. 

Kristin Keylor

Administrative Assistant

Kristin supports our Team as an Administrative Assistant, which means she wears a lot of hats in the office – she answers the phone, schedules and confirms appointments with clients, does data entry, and social media management just to name a few of her tasksShe is a 2021 graduate of Berks Christian School and grew up in Reading, PA.  She loves to play volleyball and paint in her spare time, and is pursuing art & design as a passion. 

Tyler Heist

IT Systems Integrator

Tyler can best be described as a “wonder-wizard” of all things technological! Working with automating processes to make the company run smoothly, and giving a helping hand with all of the IT equipment, as well as ensuring the customer experience is satisfactory– Tyler gives his all in making sure Mast is up to snuff!

Tyler is currently pursuing his Bachelor’s Degree in Computer Science, with a concentration in Software Engineering. His hobbies include hiking, reading, and, of course… programming! He also has a special passion for Cybersecurity Technologies!

Our Field Staff

Jason Konnick

Senior Repair Technician

Jason Konnick is a very versatile member of our team – able to get things done wherever he is needed. From leading crews, running repair calls, performing quality control inspections, advising clients about replacements, and overseeing in-house training, Jason can do it all. He came to Mast Roofing & Construction in 2015 with 16 years of experience in the roofing industry.  He grew up in Perkiomenville and graduated from Boyertown Senior High School. Jason has extensive training with copper, managing roofing crews, and being an all-around team player. Jason and his wife Karen have a daughter named Hope. Jason enjoys spending time with his family, going to Phillies games, and going on shopping trips with Hope. 

Chris Lucas

Senior Repair Technician

Chris joined our Team in September of 2019, already having 5 years of roofing experience. He is one of our Repair Technicians, which means he can take a look at your roof, diagnose the problem, and present you with a plan to fix it. Chris grew up in Massachusetts, so watch out for that fabulous accent if you get a chance to meet him! When he’s not coming to a homeowner’s rescue, he enjoys spending time with his family, fishing, golfing, and most all other sports. 

Erich Nettles

Roofing Specialist

Erich is our newest addition to the sales team, having over 20 years of experience in the exterior remodeling industry! He cares deeply about health & personal fitness, and is a go-getter in all regards. He takes problems head-on, and when an easy solution isn’t present, he carries through with tenacity. In his free time, Erich will often spend time with his wife and 2 sons, or can be seen pumping iron at the gym.

Shane Petersheim

Senior Foreman

Shane Petersheim has been with us at Mast Roofing & Construction for a number of years – at first on and off between semesters at school, and then full-time in 2012 as one of our Roofing Foremen. He is responsible for making sure your roof is installed exactly how you want it, from tear-off to clean-up.  Shane graduated from Conestoga Christian School and went on to earn his Bachelor’s Degree in Accounting from Geneva College. In his free time, he likes to hunt, golf, play volleyball, and is a member of a hunting cabin in western PA. 

Tom Laub


Tom joined the Mast Roofing Team in May of 2021.  He is a vital member of our installation crew who started out as a Skilled Laborer, but quickly moved up to a Foreman position.  He works hard out in the elements every day to make sure that your family is covered with a quality roofing system!  He used to wrestle in high school and enjoys fishing in his spare time.

Patrick Lance


Patrick joined our Team in 2021 as part of our Field Crew. He grew up in Gilbertsville and graduated from Boyertown HS. While in college at Cleveland State University, he was a Division 1 swimmer and graduated with a major in Criminology and minors in both Sociology and Communications. He is a avid fan of fishing and enjoys TRYING to play golf. One more fun fact: he is the BIGGEST Browns fan in the state of PA! 

Tom Lesher

Sub Foreman

Tom joined the Mast Roofing team in 2023 as a Sub Foreman. He grew up in Warwick, PA and went to Center for Arts & Technology – Pickering Campus. Tom has training in OSHA, GAF, and CertainTeed Siding, and is very skilled in framing and remodeling! In his spare time, Tom enjoys motocross, mountain biking, and spending time with family.

Extin Laub

Field Crew

Extin is a valued member of our installation crew. He works hard to make sure our clients’ homes are both protected from the elements and look beautiful as well. He grew up in Seattle, Washington and graduated from Abraxas Academy. When not making magic happen with client’s homes, Extin enjoys fishing and boxing. 

Seth Mast

Field Crew

Seth grew up in Oley, PA and graduated from Berks Christian School in 2023. He has been helping out around the building since he was 12 years old – mowing, weed-whacking, cleaning both the office and our trucks, and many other jobs that supported the team here at Mast Roofing & Construction. More recently, he has come on board full-time as part of our field crew! In his spare time, Seth enjoys water skiing, hunting, and golfing.

Andrew Frantz

Field Crew

Andrew grew up around Quakertown, PA in a small town called Red Hill. He graduated from Upper Perk High School back in 2016 with a class of less than 250 students. He later graduated from Thaddeus Stevens College in 2018 with an associate’s degree in carpentry technology. In his free time, Andrew enjoys outdoor activities such as fishing, hiking, boating, and camping.

Trey Wamsher

Shop Assistant

Trey is one of our Shop Assistants – currently a Junior at Oley Valley High School! He helps clean the shop and manage the grounds here, as well as helps with other tasks. He is also attending tech school in order to learn the trades – plumbing specifically. In his spare time, Trey plays lacrosse and football, and is passionate about weightlifting! When he’s in “rest mode”, he enjoys playing video games.

Ethan Horn

Shop Assistant

Ethan grew up in Boyertown, PA and has been living here his whole life. He joined the Mast Roofing team in 2024 as one of our Shop Assistants and helps maintain our warehouse, as well as pick up materials. He also has special training in carpentry! When he’s not working, Ethan enjoys snowboarding, fishing, and hunting.

Joel Mast

Shop Assistant

Joel grew up in Oley, PA, and he will be attending Berks Career & Technology Center for Heavy Machine Operation. He’s been helping around the building for years by mowing/weed-whacking and making sure our lot is clear of snow during the winter. Joel now serves as one of our Shop Assistants and helps keep our shop organized! Outside of work, Joel enjoys riding dirt bikes, hunting, and fishing.


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