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The Hardenbergh Team

Company Leadership

Mary Hardenbergh

Founder & President

About Mary

Mary Hardenbergh, CPMSM, President and Founder of The Hardenbergh Group and Hardenbergh Interim Staffing Group, has enjoyed contributing to the medical staff and credentialing services industry since 1986. Mary was a Corporate Director of Medical Affairs when she successfully established one of the first centralized credentialing organizations and single medical staff structures in the country for a major multi-entity health system in 1988. This led to national attention and the development of a sought-after healthcare consulting business. Mary discovered a need in the staffing field while consulting in hospital medical staff departments that could not be overlooked. The demand for highly-skilled temporary medical staff professionals (MSP) around the country was evident. She created a team of many of the best certified MSPs around the country to travel on-site to health systems, CVOs, credentialing departments, insurance plans, and other healthcare entities to step in and provide their expertise seamlessly, efficiently, and needing no training. Many of the original MSP team is still lending their expertise to Hardenbergh 20+ years later, in addition to the hundreds more that have joined the Hardenbergh pool of phenomenal medical services professionals.

Hardenbergh continues to be the leader in the staffing industry for medical staff services and credentialing with the help of these “best of the best” MSPs and a top-notch corporate team continuing the personalized-service approach with both contractors and clients, which has allowed Mary to change business gears and become active in other community and national projects.

Judy Belknap

Vice President

About Judy

Judy is the primary liaison and interface with our clients.  As a dual certified (CPCS/CPMSM) Medical Services Professional (MSP) with over 20 years’ experience, Judy’s vast industry experience, knowledge and expertise are instrumental to understanding each individual client’s needs to successfully identify the right MSP for the role and to ensure the client experience with Hardenbergh is positive.  Judy believes business is centered on fostering relationships and establishing a foundation of trust with clients and MSPs which includes training, coaching, and mentoring. Prior to joining The Hardenbergh Group in 2008, Judy gathered invaluable experience traveling across the United States in various MSP roles. She was instrumental in developing centralized credentialing operations for major health systems, restructuring medical staff services departments, and promoting process improvement and credentialing initiatives to help clients formulate an effective strategy to ensure compliance with regulatory mandates. 

Judy is a graduate of Central Michigan University with a concentration in Organization Administration, and is pursuing her Masters in Leadership and Project Management.

Donna Delevie

Vice President

About Donna

Donna oversees Hardenbergh's day-to-day business operations and is primarily responsible for attracting, retaining, and working with our Medical Services Professionals and supporting our client needs.  She joined the firm in 2008 to help with internal processes and business initiatives supporting the firm's business growth.  Since that time, Donna has been involved in or worked directly in every functional area of our business.  She values and finds the people side of her role the most enjoyable and enriching.  Donna brings more than 20 years of project, training and workforce management experience within both small and Fortune 500 organizations. Donna holds a Bachelor's and Master's degree in Business Administration.

In her spare time, Donna most enjoys spending time with her friends and family and it is always a bonus when that can be coupled with doing something fun and exciting while checking off the places on her travel bucket list. 

Bennie Fazzino

Office Coordinator

About Bennie

Bennie has worked with Hardenbergh since 2011.  She supports our clients and consultants in numerous ways.   Bennie also supports the firm's engagement with approximately 60 NAMSS-affiliated conferences.  Bennie believes you differentiate yourself as a business in small ways, too.  Bennie ensures each interaction our consultants and clients have with Hardenbergh is positive.  She never misses an opportunity to acknowledge a colleague's birthday, milestone or special event.

Bennie majored in accounting at Sam Houston University and, after a successful career in the Detroit Public School System, joined Hardenbergh.  Bennie is very active with her church and cheers for her Detroit Tigers baseball team.  Bennie is very proud of her 4 children and 5 grandchildren.  Bennie is an avid traveler and recently visited Poland, Italy and Ireland.

Lynn Snider

Placement Coordinator

About Lynn

Biography coming soon.                                             

Gretchen Kaminski

Placement Coordinator

About Gretchen

Gretchen’s focus at The Hardenbergh Group is to ensure a smooth and timely internal onboarding process for our consultants.  She is a team player, assisting the back office in whatever the daily needs may be.  Gretchen joined The Hardenbergh Group in June 2015, previously having put her Bachelor’s degree to use working as a paralegal in the financial industry.  During her time away from the office, she enjoys reading, traveling and spending time with family and friends.


Placement Coordinator

About Betsy

Betsy is known for her energy, communication skills, and knowledge of credentialing.  Betsy joined The Hardenbergh Group in 2016 as a Placement Coordinator.  Prior to working with Hardenbergh, Betsy spent six years as a credentialing leader and Risk Manager with Military Credentialing Solutions, Inc.  Her background in customer service, clinical credentialing, and risk management allows her to effectively work with our clients to ensure consultants are onboarded in a timely manner.  She thrives on interacting with consultants and clients alike, and is dedicated to ensuring their needs and interests are met above all else.
 Betsy is a graduate of Mercer University with a Bachelor's degree in Business.

Sheri Robinson


About Sheri

Sheri has been the accountant for The Hardenbergh Group since 2010. She is responsible for all financial matters of the business. With a degree in accounting from The University of Michigan, she has more than 20 years of experience. She has worked to help multiple companies build their accounting processes from inception to day-to-day operations. When she is not working, she enjoys watching her son play baseball, attending University of Michigan hockey and football games, and reading. 

Kathy Wendt

Project Manager

About Kathy

Kathy has been with Hardenbergh since 2010 as a Project Manager.  She is involved with coordinating many facets of our day-to-day business. She oversees our support of the NAMSS-affiliated annual state conferences, various marketing initiatives, and assists with internal operational projects to support our consultants. Every new project she undertakes interfaces with most areas of the company.  The opportunity to improve Hardenbergh’s levels of service delivered to our clients and contractors is the part of her job she enjoys the most. 
Kathy has over 20 years of experience in sales and marketing, working in the pharmaceutical products industry, recruiting software, and she was the International Marketing Manager for a global sporting goods manufacturer. Kathy has a Bachelor of Science degree in Merchandising Management from Michigan State University. In her spare time, she and her husband most enjoy watching their two teenage sons on the baseball field or basketball court. 

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