Ettiene is the chief editor and co-author of the Practical Tax Handbook for SMMEs (since 2003); a regular speaker at update and training seminars, and regular contributor to various publications and media.

He is the chairman of the National Tax Committee and member of the Technical and Standards Committee of the South African Institute of Professional Accountants, actively involved in the SARS Joint Stakeholder Committees, and specific sub-task force teams.

He was an elected member to the FASSET (SETA for Finance, Accounting, Management Consulting and other financial services) Management Board for two years, chairman of the Finance Committee, and also served on the Remuneration, and Executive Committees.

He is a member of the working group for the drafting of financial reporting standards for Non-Public Entities (also referred to as Micro-gaap) as issued by SAICA and ECSAFA.

Ettiene serves on the panel of reviewers for the South African Tax Journal (the journal is issued by UNISA, University of Johannesburg, and University of Pretoria), and as an assessor for the Deneys Reitz Tax Thesis annual competition.

Ettiene holds membership with the Institute of Directors and South African Institute of Professional Accountants, and is registered with SARS as a tax practitioner.