Tandem HR is an HR outsourcing company or Professional Employer Organization (PEO) providing HR solutions to businesses of all sizes since 1998.

As the largest privately-held Midwest PEO, we pride ourselves on our ability to provide high-touch HR solutions that increase shareholder profitability. Tandem HR offers a variety of options and flexible human resource solutions to fit your business needs. Choose from our Professional Employer Organization (PEO) or Administrative Services Organization (ASO) business models to bring the most effective HR solutions that will boost productivity and, ultimately, grow your bottom line.

We also pride ourselves on our expert service teams. They are knowledgeable, experienced, and dedicated to providing professional and friendly service to you and all of your employees. Our high-touch business model gives you direct access to your service team. They conduct employee onboarding, benefits orientations, employment law compliance checks, and much more. Each and every team member has our company values at the forefront of their mind as they service client accounts.

The Tandem Family of Companies

Tandem HR is a proud part of the Tandem Family of Companies. How did the family begin? Bruce Leon, a Chicago area benefits consultant and insurance agent, founded a full-service insurance agency called Benefits Solutions Group in 1997. Bruce immediately identified a unique need among small and mid-sized businesses for outsourced human resource assistance beyond benefits. The market was missing a high-touch customer-centric business model. By 1998, Bruce officially established a PEO called Tandem Professional Employer Services.

With two companies working in tandem, business began growing rapidly. Initial growth was attributed to word-of-mouth referrals from satisfied clients and business partners. In 2006, the Tandem Family of Companies welcomed Alliance Workplace Solutions, a division that focuses primarily on voluntary benefits. This gave clients the option to offer affordable employee-paid and owned benefits to supplement benefits packages. In 2008, Tandem PES changed its name to Tandem HR to create more understanding among prospective clients about the services provided by the PEO. In 2011, Workplace Solutions Employee Assistance Program (EAP) joined the Tandem Family of Companies bringing a full-service employee assistance program in-house. In 2018, the company began to expand its physical footprint adding locations in Indiana, Wisconsin, Michigan, and Missouri.

The Tandem Family of Companies currently boasts a staff of over 140 employees, servicing hundreds of thousands of worksite employees nationally with benefits, human resources, and EAP needs.



Deliver holistic, people-centric solutions that fuel client success



To be the preferred partner for HR solutions



tandem hr core values


We act with integrity and transparency. We do what we say we will do.

We put people first and work together to achieve our goals. We win as a team.

We work with persistent determination. We do what it takes to deliver on our promises.

We actively listen and seek to understand. We work in a spirit of partnership.

We take responsibility. We own our words, actions, and results.

We create fulfilling and rewarding workplaces. We celebrate success.



2400 Wolf Road
Westchester, IL 60154
(630) 928-0510
1311 W. 96th Street, Suite 280
Indianapolis, IN 46260
(317) 961-5805
211 N. 1st Street
Brighton, MI 48116
(248) 341-2400

300 Hunter Avenue, Suite 200
St. Louis, MO 63124
(314) 530-5466
1010 E. Washington Avenue, Suite 314
Madison, WI 53703
(608) 258-5525
309 N. Water Street, Suite 235
Milwaukee, WI 53202
(414) 435-7200

In the Press



Learn more today!

We want to be the first-choice trusted advisor for organizations looking to build an exceptional workplace. Is that you? Learn more about us, why we believe we provide the best solutions, what our clients think about our services, and what Tandem HR does in the community.

For more information call Tandem HR today at (630) 928-0510.

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