Cale Siegmann - Omnis Group Client Manager

Client Manager

Cale Siegmann

Omnis Business Advisory

Cale brings over 12 years of accounting and business management experience to his role at Omnis. Specialising in business advisory, tax strategies and business structuring advice, Cale excels at simplifying complex financial concepts into everyday language. His proactive approach ensures that Omnis clients receive practical, tailored solutions to support their goals.

Cale works closely with family businesses and NDIS providers, helping them navigate unique challenges with a focus on sustainable growth and compliance. Whether advising on tax efficiency or guiding structural changes, he is dedicated to delivering outcomes that align with his clients’ long-term success.

Outside of work, Cale enjoys freediving, scuba diving and playing social basketball, combining his love of the ocean with an active lifestyle.

Areas of Expertise:

  • Business Advisory
  • Tax Strategies
  • Structure and Restructuring Advice
  • Family Businesses
  • NDIS

Qualifications & Memberships:

  • Certified Practicing Accountant (CPA)

  • Bachelor of Commerce, Double Major in Accounting and Taxation

Omnis People

Justin Flavel

Managing Director

Justin’s experience spans across 20 years in accounting, financial analysis and general business practice.

Although born and bred on the land, Justin’s interest was more in spreadsheets, ledgers, and finance which led him to attend university. In 1992, Justin graduated with a Bachelor of Business majoring in Accounting and Finance. As well as qualifying as a CPA member and becoming a Fellow of the Taxation Institute of Australia, he began gaining practical experience in small and mid-tier accounting practices.

During the late 90s, Justin decided to expand his horizons and travel through Europe. It was during this time that he seized the opportunity to expand his knowledge on the workings of large organisations by taking on roles in multinational corporations.

Today, Justin’s passion is in facilitating businesses to grow and evolve. His focus is on acting in the role of business mentor to help clients develop the full potential of their businesses. He joins clients on their unique journey, and provides the tools and knowledge they need along the way to make the right decisions.

Justin’s aim for his clients parallels his own philosophy and personal journey—focusing on his own career growth and business success while maintaining balance in his life with his wife and three daughters.

Omnis Group Managing Director - Justin Flavel