Ronald Yencken

Principal and Owner

After graduating from Churchlands College/Edith Cowan University in 1981 with a Bachelor of Business, he commenced his professional career in his home town of Kojonup. With a farming background, Ronald worked prominently with farming clients but also spent a great portion of his time with Self Managed Superannuation Funds.

Ronald moved to Perth and gained is CPA membership in 1998. After gaining experience and knowledge with other accounting practices, Ronald decided to take on the challenge of owning and being the Principal of his own Practice. To that end, his purchased this long established, Fremantle based, practice in Petta Yencken and Company in February 2012.

Ronald has extensive knowledge and experience in taxation and business matters. Has exposure to businesses ranging from small to large and is qualified to assist your business in many facets.

With recent changes in law as to Accountants/Tax Agents authority to advise on Self Managed Superannuation Funds (SMSF), Ronald has completed the accreditation and is now an Authorised Representative (No. 124 5302) of SMSF Advisers Network Pty Ltd (AFSL No, 430062). Please see our dedicated page on SMSF .

Ronald is married to wife Laura and together they have a young son Johanes.

Fred Casonato


Fred graduated from Curtin University in 1988 with a Bachelor of Business. Completed his CPA accreditation in 1993. He originally joined the Practice (under its former name Petta & Associates) in 1992.

Fred has extensive knowledge and experience with Taxation, Business, Superannuation and Corporate matters. Fred can assist with taxation advice, business structures and advice, superannuation and estate planning. Has exposure to variety of accounting software ( MYOB, Quickbooks and Xero) enabling Fred to assist with setup and/or other issues that you may have.


Administration & Receptionist