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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.

Bob Wiemer


About Bob

Bob Wiemer, CEO of The Hardenbergh Group, has more than 20 years of healthcare experience and is responsible for setting our vision and strategy, assuring the accomplishment of business objectives, securing resources for growth, and working with the team to support our vision on behalf of our clients.

Prior to joining The Hardenbergh Group, Bob served as Vice President for eight years at Quorum Health Resources, a former wholly owned subsidiary of Community Health Systems (NASDAQ: CYH). At Quorum, he led the strategy, product development, and operations of a division focused on informing and advising hospital CEOs, CFOs, trustees, physician leaders, and other healthcare professionals about the evolving healthcare landscape, legislative changes, and the latest operating best practices. Prior to Quorum, Bob served as a member of the leadership team at HealthStream, Inc. (NASDAQ: HSTM) for nearly ten years. At HealthStream, as Vice President of Operations, he was responsible for customer service, technical operations support, account management, training, and implementation for the company’s SaaS solutions. Bob got his healthcare start in mergers and acquisitions at PhyCor, the former industry-leading physician practice management company.

Bob earned his Bachelor of Engineering degree in Civil Engineering from Vanderbilt University and his Masters of Business Administration from the University of Texas at Austin.

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

Lynn’s background in healthcare Human Resources includes recruitment and employee relations and has led her to be one of the primary placement coordinators for Hardenbergh. Lynn is drawn to the Human Resources side of the business because she can be the concierge-type who welcomes newly onboarded contractors and is able to follow their progress from the point of interviewing through the client onboarding process. Lynn especially values building relationships and helping others, as demonstrated through her volunteer efforts with select charitable organizations. Time with family is priority when Lynn is outside of work. She enjoys traveling and indulging in her passion - interior design. Lynn is originally from the St. Louis, Missouri area.

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.


Lead 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.

Kathy Wendt

Business Development Manager

About Kathy

Kathy has been with Hardenbergh since 2010 as a Business Development 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. 

Barbara Warstler, MBA, CPMSM, FASPR

Associate Vice President, Client Relations

About Barbara

Barb is a key liaison and interface for our clients.  She has nearly 20 years of experience in credentialing, medical education, physician relations, and physician recruitment. Prior to joining Hardenbergh, Barb served as the director of medical staff services, credentialing, and provider enrollment at University Hospitals Health System (UH) in Cleveland, OH where she began in 2007 as the manager of the medical staff office. At UH, Barb led the centralization of UH's medical staff services and credentialing departments, the department’s conversion to a paperless operation, and the integration of six new hospital medical staffs into the system. Prior to UH, she served as an independent contractor for Hardenbergh and held various leadership roles in medical staff services and physician relations and recruitment at other medical centers.

Barb earned her Bachelor degree and graduated Cum Laude from Kent State University and earned her Masters of Business Administration from Ashland University. In addition, she has completed a fellowship in medical staff development, earned her certification as a physician recruiter through the American Academy of Medical Management, is a certified fellow in the Association for Advancing Physician and Provider Recruitment, and holds CPMSM and Lean Six Sigma certifications.