Meet Our Team

Our firm provides outstanding service to our clients because of our dedication to the three underlying principles of professionalism, responsiveness and quality.


jason bitner

Jason A. Bitner, CA, CPA (U.S.), CTA, CGMA

Jason Bitner graduated with a Bachelor's degree from Illinois State University with a double major in Accounting and Finance. He began his accounting career as a financial controller with direct reporting to the executive officers. After two years, he moved to public accounting and was later employed as a Tax Manager, reviewing and preparing tax returns, providing controllership services, and tax consulting to several individuals and businesses. Jason is a licensed CPA in the State of Florida. Jason also has expertise and extensive experience in Australian Tax Laws, including the understanding of international double tax agreements. He is a Chartered Accountant, Chartered Tax Adviser, and Registered Tax Agent in Australia. He has worked as an Australian Superannuation Fund auditor and tax manager for two firms in Perth. He has also represented many clients during Australian Tax Office (ATO) and Internal Revenue Service (IRS) audits.


  • CPA licensed in the State of Florida

  • Chartered Accountant (CA) member of Chartered Accountants Australia and New Zealand

  • Registered Tax Agent in Australia

    • Chartered Tax Adviser member of the Tax Institute of Australia

    • Chartered Global Management Accountant (CGMA)

    • American Institute of Certified Public Accountants

    Florida Institute of Certified Public Accountants


Ken Yinzhen Xu

Ken Yinzhen Xu, CA, EA (U.S.), ATI, MPA

Ken brings global knowledge to our firm. He is a member of our tax compliance and self-managed superannuation fund team. Originally from China, Ken completed his bachelor’s degree in engineering at Chongqing University in China. Since moving to Australia in 2012, Ken completed his master’s degree in professional accounting at Murdoch University. He is a Chartered Accountant and Associate Member of the Tax Institute of Australia. He is also an enrolled agent and is a federally-authorized tax practitioner in the U.S.


  • Enrolled Agent (EA) federally-authorized tax practitioner in the U.S.

  • Chartered Accountant (CA) member of Chartered Accountants Australia and New Zealand

  • Associate Member of the Tax Institute of Australia (ATI)



Amicas Group is an international taxation and accounting firm with an emphasis on building long-term relationships with our clients to ensure their overall taxation and financial position is maximized. We work with you to understand your financial needs, and will involve other specialists where required for comprehensive advice. This will include working with your existing investment adviser and/or legal adviser to ensure your financial position is safe, supportable and meeting your needs. Amicas Group began in 2009; it has grown over time with clients looking to build a long-term relationship with their tax adviser, who has a deep understanding of their personal situation.

Our firm primarily exchanges information electronically via email and fax. Though, we welcome in-person meetings. We serve clients all over the world. We have specialist knowledge of U.S. and Australian tax laws and serve Americans (Expats) globally and clients all over Australia.



Contact Us

United States Contacts:

Telephone: +1 904 942 8422
Fax: +1 904 212 2223

Australian Contacts:

Unit 1, 90 Moreing Road
Attadale WA 6156

PO Box 3065
Myaree WA 6154

Telephone: +61 8 9330 8790

Fax: +61 8 9238 0798
Mobile: 0488 020 286