Kassim is a Partner in Mishcon Private. He advises UK and international clients on all aspects of personal as well as business taxation. Kassim is a specialist in both personal and corporate tax. As a result, he is regularly sought out by clients for advice on all of their assets including those owned directly, through trusts or other similar structures.

Kassim has extensive experience with structuring the tax efficient acquisition, ownership and disposal of shares, securities and real estate, the interpretation of double taxation treaties, all taxation aspects relating to M&A transactions, and the application of transfer pricing rules.  His client base is predominantly high and ultra-high net worth individuals with assets in multiple jurisdictions but he also advises a number of international, UK, European and Asian based businesses as well as US based multinationals.

A member of the firm's multi-disciplinary Luxury Assets Group, Kassim also advises individuals and businesses on the buying, selling, structuring and protection of luxury assets across the globe.  He is a member of the International Fiscal Association, the International Bar Association, and the International Employee Benefits Association.

Kassim is recognised by The Legal 500 where clients describe him as "knowledgeable and commercial".