leadership at erc About Us


The Leadership Team at ERC carries a broad range of expertise in waste management, engineering, chemistry, environmental services, business operations, and other dynamic fields and industries.

  • Kenneth D. Lefever


    Kenneth D. Lefever President

    Education: Shippensburg University; BSBA in Accounting

    Experience: Ken became President of ERC in 2010. In just five years, he grew the company of 25 employees and $8 million in revenue to 125 employees with 3 locations and $30 million in revenue in just five years. He is also the prior owner of J Thomas Ltd. machine and fabrication shop in Lancaster, PA. Ken previously worked at Wilton Armetale in Mount Joy for 11 years as CEO/President/CFO.

    Behind the Scenes: Ken serves on the MANTEC board of directors, promoting and encouraging the prosperous development of PA manufacturing businesses in Adams, Cumberland, Dauphin, Franklin, Fulton, Lancaster, Lebanon and York counties. Ken is a former board member of the Non-Ferrous Founders Society. He was a past board member of Big Brothers Big Sisters of York, PA. Ken is an active member of the local Knights of Columbus and has been coaching youth sports since graduating from college.

    What makes ERC unique? "I believe what makes ERC unique is our people. They will do whatever it takes to get the job done and take care of our customer."

    What's the best part about working at ERC? "Again, our people. We have a culture of respect and integrity in all that we do, and it shows in our people."

  • Hannah E. Fritz, M.S.

    Vice President

    Hannah E. Fritz, M.S. Vice President

    Education: Millersville University; B.A. Geography, Concentration: Environmental Studies; Minor: International Studies; M.S. Emergency Management

    Certifications: OSHA 30-Hour, HAZWOPER 40-Hour, First Aid/CPR/AED Certified, Permit Required Confined Space

    FEMA IS Courses: 100, 120, 130, 139, 200, 201, 235, 546, 547, 821, 860, 906, 2900

    Experience: Hannah joined ERC in 2013 as a lab technician testing various environmental samples. During her time in the lab, she went back to school to obtain her Master’s in Emergency Management and transitioned into ERC's full-time Health & Safety Manager role in June 2016. Prior to ERC, Hannah worked in both the private and public sectors using Geographic Information Systems (GIS). She is the secretary and a board member of the Lancaster County Industrial Safety Council as well as a member of NORA - An Association of Responsible Recyclers. Hannah also belongs to the Order of the Sword & Shield National Honor Society.

    Behind the Scenes: Hannah's hobbies include traveling, sports, reading, and live music. Fun fact: She has been to 13 countries and 25 states! Dog sledding in Québec, watching the sun set in Santorini, hiking in Yosemite, and jumping off cliffs in Jamaica are some of her favorite travel memories.

    What makes ERC unique? “ERC focuses on their people. They recognize the individual as a person first, and an employee second. That mentality allows true growth both personally and professionally when a person feels valued, cared for, and important - and ultimately, giving that feeling back to our customers.”

    What's the best part about working at ERC? “The people! We are one giant family. It doesn't matter what your title is, we all work together for a greater purpose and make each other laugh every single day.”

  • Mark A. Rothenberger, CPA

    Chief Financial Officer

    Mark A. Rothenberger, CPA Chief Financial Officer

    Education: Lehigh University; B.S. Business & Economics

    Experience: Mark joined ERC in 2017,  bringing over 18 years of accounting and finance experience to his role as Chief Financial Officer. He served as the Director of Financial Reporting & Consolidation for Dentsply Sirona Inc. Prior to that, he was a Senior Associate, Assurance Services at Arthur Andersen.

    Behind the Scenes: Mark enjoys spending time with his wife, Jamie, and three children: Owen, Ava and Ethan. His hobbies include coaching basketball, playing golf, and watching Philadelphia sports teams.

    What makes ERC unique? “I enjoy seeing how we bring together employees with varied and rich experience to make waste solutions easier for our customers.”

    What's the best part about working at ERC? “We live our values every day of Customer Focus, Respect, Integrity, and Compliance. They aren't just words. They are actions we strive for everyday to help guide us no matter who we meet.”

  • Kermit L. Burkholder

    Director of Research & Development

    Kermit L. Burkholder Director of Research & Development

    Education: Penn State University; B.S. Chemical Engineering

    Experience: Kermit has been with ERC for the past 30 years, bringing a breadth of chemistry experience and engineering knowledge to his role as Director of Research & Development. Prior to ERC, Kermit had the opportunity to work under several of the country’s top waste oil engineers and chemists for five years. The hands-on education he received while working within these industries was invaluable.

    Behind the Scenes: In his spare time, Kermit enjoys building model ships and helping his kids with their new homeowner issues.

    What makes ERC Unique: “We will do everything within our ability to take care of our customer’s needs.”

    What's the best part about working at ERC? “Even though we’ve grown an incredible amount over the past 30 years, ERC still feels like a family.”

  • Peter C. Haiges

    Vice President of Environmental Services

    Peter C. Haiges Vice President of Environmental Services

    Education: University of Maryland College Park; B.S. Marketing

    Experience: Pete brings 15 years of sales and operational experience in the residual waste and environmental services industry to his current role as General Manager of Environmental Services at ERC. His background includes two years in sales, two years as an Operations Manager, six years as VP of Operations, and five years in Environmental Services with time spent as Field Services Sales/Manager prior to his GM role.

    Behind the Scenes: Pete's hobbies include skiing, soccer, hiking, cooking, and construction. He is a volunteer at St. Leo The Great Catholic School (fundraising) and an advisory board member for STEAM Team, an after-school program providing introduction to science, technology, engineering, arts, and math skills.

    What makes ERC unique? “ERC is dedicated to identifying ways to divert as much waste as possible from landfill sites and focus more of our efforts on recycling.”

    What's the best part about working at ERC? “Our people! There is a large family atmosphere on a daily basis. Everyone is always willing to go that extra mile for their coworkers. It is one of the major driving forces that makes me excited to come to work every day.”

  • R. Michael Mulrine

    Environmental Manager

    R. Michael Mulrine Environmental Manager

    Education: University of Delaware; B.S. Chemistry

    Experience: Mike brings over 25 years of residual and hazardous waste industries to his role as Environmental Manager. He has worked as a lab pack chemist, de-pack chemist at a hazardous waste incinerator, and Disposal Manager at a Part B Treatment, Storage, and Disposal Facility. Mike has been with ERC for over 17 years and is a former member of the York County Solid Waste Advisory Committee. His depth of knowledge in environmental regulations and  management of our  DEP-certified lab facility ensures a high standard of accurate testing and treatment of material at ERC.

    Behind the Scenes: Mike's hobbies include ice hockey, softball, golf, reading, and fishing. Fun fact: Mike was a Civil War re-enactor for over 10 years.

    What makes ERC unique? "The interactions between the people, and the ability to get to know everyone from the President down to the newest technician."

    Best part about working at ERC? "The people."

Not Sure What You Need?

We are here to help.


Contact Us