Practice History & Experience

Solutions, CPAs PC is a local full-service accounting, auditing, and tax preparation firm of certified public accountants providing services to private and public clients in eastern Oregon. Solutions is a successor organization to Oster and Arntz, a partnership of Arlie W. Oster and James K. Arntz. Mr. Oster founded the firm in 1963 and operated under four other partnerships before forming Oster and Arntz in1989. The corporation was formed on June 1, 1992 as Oster Professional Group, CPAs (OPG) and was the immediate successor organization to the above referenced Oster and Arntz partnership. On January 1, 1993, Robert M. Armstrong and George W. Wilber acquired 100 percent of all outstanding shares of stock of the corporation, one half each.

On January 1, 2014, the John Day and Burns offices each organized as separate corporations (OPGCPA, PC and GW Wilbur & Associates, respectively) and continued to operate as partners of Oster Professional Group, CPAs LLP through December 2018.


January 1, 2018 the two office corporations entered into an agreement whereby on January 1, 2019, the Burns office would obtain sole use of the Oster name. As a result of this agreement the John Day office renamed their corporations from OPGCPA, PC to Solutions,


CPAs PC. The shareholders before and after the name change included Robert Armstrong, Jessica Knowles, Mitch Saul, Anna Bass and Amy Walker.

As of January 1, 2019, Mr. Saul, Ms. Walker, and Ms. Bass acquired the outstanding shares owned by Mr. Armstrong and Ms. Knowles. Mr. Armstrong will continue to work for the company for several more years and serve in an advisory capacity. Currently the ownership of the firm is estimated as follows: Mr. Saul 40%, Ms. Walker 35% and Ms. Bass 25%.

Mitch Saul

Managing partner

Mitch is a licensed CPA and Municipal Auditor in Oregon since 2012. He has...

Amy Walker


Amy is a Certified Public Accountant since 2014 and an Oregon Municipal Auditor since...

Anna Bass


Anna is a private accounting, municipal accounting, tax preparation and...

Harmony Piazza

Staff accountant and auditor

Harmony is a staff accountant and auditor for Solutions, CPAs PC since 2017. Graduated...

Carli Bremner

Staff accountant

Carli is a staff accountant who enjoys working with clients for their payroll, bookkeeping...

Chandra Holliday


Chandra has worked for the firm since 2012. She has her husband Ben have two...

Jeremy LaFramboise

Auditor/tax preparer

Jeremy is an auditor/tax preparer and joined Solutions part time in the fall of...

Bob Armstrong


Bob started working for Arlie Oster in 1990. In 1991, opened the John Day...

Lauri Armstrong

Office Manager

Lauri our office Manager since 1991.  Specializing in payroll and bookkeeping...





Melissa is our administrative Assistant proudly assisting clients and staff at Solutions since February...


Jan 2020 Stairs cropped
Jan 2020 Down by the river
January 2020 arch 1
January 2020 coats



Solutions CPAs PC

101 NE First Avenue

John Day, OR 97845

© 2020 Solutions Certified Public Accountants, PC