John D. Callahan, Jr.

I am dedicated to helping each of my clients achieve success through responsive, trustworthy and high quality service.

Jack’s Biography & Credentials

Jack Callahan

Jack joined Leone, McDonnell & Roberts, Professional Association in 1985. As Treasurer of the firm, he manages the firm’s finances and internal accounting.

In this role, his tenacity, decisiveness, and visionary nature help him guide the firm’s overall strategy and day-to-day operations, including firm policy decisions, strategic planning, human resources and marketing.  Jack specializes in serving clients in the not-for-profit and construction industries, as well as small, family-owned businesses.

Jack credits his professional success to his hard work and the personal relationships he develops with his clients. He also places a strong emphasis on the value of honesty and is perpetually committed to providing trustworthy, reliable service.

Jack was raised in Scarborough, Maine and currently resides in Wolfeboro, New Hampshire. He and his wife, Tawna, have three children. In his free time, Jack’s hobbies include playing golf and running. He is also a sports fan and enjoys spending time with his family.



  • Certified Public Accountant (CPA)
    • New Hampshire


  • American Institute of Certified Public Accountants (AICPA)
  • New Hampshire Society of Certified Public Accountants (NHSCPA)
  • Great Waters
    • Board of Directors


  • Saint Anselm College
    • Bachelor’s degree (1985)
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