Osman has specialized in tax for almost 30 years. His primary focus has been corporate international tax and transfer pricing, although he also has extensive experience in other tax types (such as personal tax and value-added tax). He is a Chartered Accountant, and holds post-graduate qualifications in accounting and tax. His career spans primarily tax consulting to multinationals, but also academia, tax technical counsel and professional development. He is a Partner at PwC, an Associate Professor at the University of the Western Cape, and is a former Chair of the National Tax Committee of the SA Institute of Chartered Accountants. He is active in tax policy and tax law design, interacting at senior levels with the SA National Treasury and the SA Revenue Service, as well as before the SA Parliament. He is also regularly interviewed and quoted in the media.