Changing the Way the World Solves Problems
We turn everyday challenges into opportunities.
Take Your Problem Solving to the Next Level
Fifth Sierra was founded with one mission: to make problem-solving skills accessible to everyone, not just big businesses. We believe that Lean Six Sigma isn’t just for corporations—it’s a life skill that can benefit students, professionals, and business owners alike. Whether you’re looking to streamline operations, improve efficiency, or simply learn how to think critically, our training programs give you the tools to make a real impact.
A Master Black Belt on a Mission
Meet Our Managing Consultant
Since 2012, Mabel Shelton has led a wide range of industry-impacting projects across the Aviation, Healthcare, Customer Service, and Trucking industries. In that time, she has also coached more than 2,500 employees and business owners in Lean Six Sigma methodologies.
At the start of 2021, Mabel founded Fifth Sierra Consulting to expand her influence beyond Corporate America.
As a seasoned Master Black Belt, her belief is that businesses of all sizes and people of all ages can enjoy the problem-solving benefits of Lean Six Sigma.
Our Consulting Team
Corey Shelton, FF, EMT-P, GB
Corey is a firefighter, paramedic, and entrepreneur. He has championed continuous improvement by applying Lean principles in emergency settings and benchmarking business practices from top-performing companies around the world.
Corey brings an action-oriented mindset and a passion for operational excellence to his role at Fifth Sierra, where he supports executive training with real-world insight and cross-industry perspective.
Wendy Shelton, RN, BSN, GB
Wendy is an experienced nurse leader with 30 years in long-term care, hospital and clinical operations. As a CRN and Clinical Nurse Manager, she has applied Lean principles to streamline processes, reduce waste, and improve outcomes for patients and staff alike.
With a career rooted in caring—for patients, clients, and students alike—Wendy brings both strategic insight and hands-on healthcare experience to Fifth Sierra’s work.
Corbin Paul, GB
Corbin is a Lean Six Sigma leader with a background in manufacturing and a passion for education. Formerly the Quality & Lean Manager at Gastite, he now drives process improvement for Amazon’s D2AS (Device, Digital, and Alexa Support) team.
Corbin has a shared passion for our next generation – frequently volunteering to give back to local high schools and his community.
Keri Monczynski, MHR, BB
Keri is a human relations professional and DOD investigator with a career rooted in service, precision, and care. For nearly a decade, she conducted high-stakes background investigations, honing her ability to navigate complex systems with efficiency. Now, Keri improves military processes from the inside out using Lean Six Sigma.
Keri shares a core belief with Fifth Sierra: Lean Six Sigma doesn’t just improve processes – it can improve people.
Featured in the Media
Bringing Lean Six Sigma to Schools & Beyond
Not long ago, Lean Six Sigma was something you’d only hear about in corporate meetings and executive training programs. Mabel Shelton helped change that. She’s been featured in articles showcasing her groundbreaking work in making Lean Six Sigma training available to students, teachers, small businesses, and professionals across industries. Her work has helped bring problem-solving skills to people of all ages, proving that Lean Six Sigma isn’t just for executives—it’s for everyone.