Professional Development

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The more you know, the more you grow.

At Tonneson + Co, you don’t have a job. You have a career. We know that employees who pursue professional development opportunities are happier and more productive. It benefits all of us to make sure our people have the chance to challenge themselves and grow. That’s why we’re committed to cultivating talent and helping all our employees achieve their full potential through learning and development programs, training courses, and mentoring.

Continuing Education and Training

It’s no coincidence that our employees are eager to challenge themselves, personally and professionally. We believe that you should never stop learning—and so do the people we hire. That’s why we make it easy to further your industry knowledge and satisfy your continuing education requirements.

In addition to regular internal trainings taught by our own audit and tax staff, continuing education opportunities include:

  • Industry conferences
  • Webinars
  • Networking and social events
  • Volunteer opportunities
  • Business development meetings

We are proud to be named to Accounting Today’s 2023 list of Best Accounting Firms to Work For. Our firm was also named to this list in 2022, 2021, 2020, 2019, 2018, and 2016.

In 2023, we were recognized as an “Inclusive Workplace” by Best Companies Group, a workplace culture and employee engagement expert, and COLOR magazine, a leader in corporate inclusivity. We were also named to this list in 2022. 

Tonneson + Co was named to the list of Largest Accounting Firms in Massachusetts by the Boston Business Journal. We are ranked as the 22nd largest firm in the state in 2024 and 2023. This data is based on the number of employees, CPAs, and partners in Massachusetts.

accounting today logo for the 2021 best firms for womenWe were proud to be named the #1 firm for Women in the U.S. by Accounting Today. This recognition is based on the direct feedback from our female staff to a comprehensive employee survey.

Greater Boston Chamber of Commerce Small Business of the Year award 2021
We were named Small Business of the Year 2021 in the Innovation and Growth category, by the Greater Boston Chamber of Commerce. This award recognizes businesses that develop or utilize technology and practices that innovate and accelerate their growth. 

We've received an impressive 4.6 rating on Glassdoor, which reflects our commitment to creating a positive and fulfilling work environment for all of our employees.


We've received an impressive 4.6 rating on Glassdoor, which reflects our commitment to creating a positive and fulfilling work environment for all of our employees.

Two employees having a mentor meeting conversation sitting down.

Mentor Programs

We care about our employees’ personal and professional growth, and we want them to have the support they need to achieve their goals. Our Mentor Program pairs every staff member with an advisor they can rely on for guidance and insights about their career paths. This program creates a two-way relationship between mentors and mentees, with an emphasis on authentic, honest conversations that result in growth and employee satisfaction.

New Hire Onboarding


The first impression counts—and we aim to make a good one. Each new member of our team meets with our HR department for an introduction to all things Tonneson. They receive department-specific training and learn how to use our management systems, databases, and tools.

Every fall, we welcome a class of new associates to the firm. Their first two weeks are devoted to orientation and training. We provide extensive guidance focused on their department skillset while also exposing new team members to staff across the firm.

Leadership + Innovation

From senior leadership to entry-level talent, we believe that all our employees should have the opportunity to improve their leadership skills, network, and stay on top of industry trends and developments. We frequently send our staff to AICPA ENGAGE, GGI Conferences, MA Conference for Women, and several conferences hosted by the MassCPAs, to name just a few.

Three employees walking down a hall at an office.

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