About Us

K2N Advisors & CPAs in Windham, NH, offers a complete suite of services for businesses and individuals that you would expect from a reputable CPA firm – audit services, tax services, and accounting support – but we are proud to say that we take our role a step further. Our goal is for you to be able to rely on us to be a part of your team of strategic business advisors, helping you through the difficult decisions you face day-to-day and week-to-week in managing and growing your business.

We feel that the success of our long-term client relationships is due to our responsiveness to clients’ needs, our experience, and our creativity. For decades, we’ve had the privilege of advising companies of all sizes in a variety of industries which has provided us with the background and breadth of knowledge to provide you sound advice and guidance for the challenges you may face running your business. Whether it’s a formal consulting assignment for developing a new business plan or advising you on a transaction to buy your largest competitor, or even just a phone call to run an idea past us, we are there for you.

Our Philosophy

Our Philosophy is simple; Provide services of value and innovative solutions to all clients – Always!

Every client survey indicates that quality and timely service are the cornerstones of a CPA firm’s success. In addition, clients want an empathetic and understanding advisor. Our goal is to meet our clients’ definitions and perceptions of quality service. We expect our clients to have high expectations of us and we continually strive to meet or exceed those expectations. Our commitment to client service and community and our forward thinking are what we believe sets us apart from other CPA firms.

We view our relationship with our clients as that of an advocate and advisor, as well as independent accountants. Our organization was founded on the premise that businesses need experienced advisors. We retain the experienced staff we believe is necessary to provide the quality advice and service our clients are looking for. Our firm constantly stays current on all matters of accounting software solutions, bookkeeping, accounting, auditing, and taxation in a very rapidly changing environment so you can be sure that you are receiving the best advice possible.

A Dedicated Team


David Kiley, partner of accounting services company OSGroup in Windham, NH

David Kiley

David joined the firm in 2011. He is a licensed CPA in Massachusetts and enjoys proactively assisting clients in strengthening their strategic, accounting, and compliance positions while minimizing tax since 1994.

David has direct experience in tax preparation, assurance, and business advisory with various local industries including manufacturing, construction, retail, health care, import/export, and professional services among many others.

Prior to joining K2N Advisors & CPAs, David was a principal with a North Shore Massachusetts CPA firm. He graduated from the University of New Hampshire in Durham with a B.S. in Business Administration. He is affiliated with the AICPA and Massachusetts Society of CPAs and other local business and community-based organizations.

David lives in Atkinson, New Hampshire with his wife and three children.

Joel Olbricht, partner of business plan provider OSGroup in Windham, NH

Joel Olbricht

After receiving the BBA from Abilene Christian University (Abilene, TX) in 1982, Joel also passed the CPA exam that same year.

As an active Partner at K2N Advisors & CPAs, Joel’s professional interests are many and varied. They include leadership, income and estate tax planning, business management and decision-making, strategic planning, building wealth, marketing, and technology planning.

Joel’s professional affiliations include board positions with several organizations: Alexander Eastman Foundation, NH Estate Planning Council, NH Society of CPAs, Derry (NH) Economic Development Council, Chester College of NE, and the Derry 21st Century Learning Community Corporation.

Joel spends his personal time with his wife and two children in addition to volunteering his time to local non-profit activities. He also enjoys photography, gardening, and US travel.

Landon Olbricht, chief technology officer of business plan provider OSGroup in Windham, NH

Landon Olbricht

Landon served active duty in the US Army from 2001 to 2005. He was deployed in Operation Iraqi Freedom from 2003 to 2004. In 2005, he joined K2N Advisors & CPAs as a tax accountant.

Landon passed the special enrollment examination in August 2011 and was enrolled to practice before the Internal Revenue Service on November 3, 2011, earning the designation Enrolled Agent (EA). Landon is the Charitable Gift Annuity Specialist. He enjoys working and consulting with the charities from around the world. 

Landon currently resides in Exeter, NH, where he enjoys cycling and home brewing.


Rachel Zins, Team Leader

Rachel joined the firm in 2019. Rachel is a Quickbooks Pro Advisor and an aspiring certified public accountant. She is skilled in charitable gift annuities and financial accounting. She is an Accounting graduate of Southern NH University where she was recognized by the School of Business for her Outstanding Leadership .

In her free time, she likes to spend time with her family and friends. She also loves traveling, watching sports, and going to concerts.

Professional Staff

Hamilton Brown

Hamilton joined K2N Advisors & CPAs in 2023. He has a Bachelor of Science in Business Administration, with an emphasis in Accounting, from Northern Caribbean University. He spent several years in broadcast media before switching careers.

He is married and enjoys playing soccer, making music, and spending time with family among other things.

Nick DiMeco

Nick joined K2N Advisors & CPAs in 2024. He graduated from Southern New Hampshire University with a degree in Accounting and Finance. He currently lives in Salem and is enrolling in continuing education for a masters degree.

In his free time, he enjoys spending time with his family and dog. He also loves to watch and play sports. 

Elizabeth Glinski

Elizabeth joined K2N Advisors & CPAs in 2020. She has a Bachelor of Science in Business Administration with a concentration in Accounting from Merrimack College. She has 4 years of experience in public and private accounting, as well as, 11 years experience running an ecommerce golf industry product company with her husband.  

She lives in Windham, NH with her husband and 3 children. In her free time, she loves baking with her children, traveling to National Parks with her family and spending time outdoors with her husband and children.

Katie Husson 

Katie is an alumni of SNHU.  She joined the firm in 2021 and is a certified Quickbooks Pro Advisor.  She has worked for CCL Plumbing & Heating since 2015 and is the Treasurer for Timberlane Music Association.

She is married with 2 teenage girls that keep her busy with theater and band.  She loves camping and visiting with many cousins and other family.   

Tyler Preston

Tyler joined K2N Advisors & CPAs in 2024. He graduated from Lake Forest College in Illinois with a degree in Finance and Mathematics. He currently lives in Manchester and is preparing to fulfill the necessary requirements for a CPA certification.

When not assisting clients, in his free time he enjoys spending time with his family, cats, and watching sports.

Benjamin Simboli

Benjamin joined K2N Advisors & CPAs in 2022. He has an Associates of Science in Accounting from White Mountain Community College with a Bachelor of Arts in Economics. His motivation comes from learning and gaining experience from the accounting professionals around him. 

Benjamin lives in Concord, NH and enjoys golfing, and Watching football.


    Cameron Allen, Accounting student at UNH




Administrative Support

Katherine A. Hamilton, employee of CPA company OSGroup in Windham, NH

Katherine A. Hamilton

Kathy joined the firm in 2007 and serves as an integral part of the administrative team.

She is married with one daughter and two dogs. Her personal time is spent enjoying her family and home, exercising, and dog training.

Cathy Schoppe

Cathy joined the firm in 2017 and serves as an administrative assistant.

Cathy is married and has two sons. In her free time she enjoys spending time with her family and friends, cooking, gardening, boating and skiing. 

Supporting Our Community

As a locally-owned and operated business, we love our neighborhoods and towns and work to make them better. We invest our time and talents to serve various community groups and you can find us donating our time with the following groups:

  • American Institute of Certified Public Accountants (AICPA)
  • New Hampshire Society of Certified Public Accountants (NHSCPA)
  • Massachusetts Society of Certified Public Accountants (MSCPA)
  • Private Companies Practice Section of the AICPA (PCPS)
  • New England Peer Review, Inc.
  • Upstream Academy Network of CPA Firms
  • Greater Salem Chamber of Commerce
  • Greater Derry Chamber of Commerce