His clients include high-tech companies, financial investors, as well as clients from such industries as clothing, watches and household goods, film studios, entertainment companies and publishers. One focus area in Alexander’s practice is the representation of several high-tech companies and an industry association in litigation with German collecting societies on copyright levies for reproduction devices. Alex also represents retail and distribution clients in countries around the world doing business in Germany and the EU in trademark, design and unfair competition matters.

Alexander is continuously recommended as a leading lawyer in the fields of "Intellectual Property" and "Copyright law" by national and international publications, such as JUVE Commercial Law Firms, Best Lawyers, and Legal 500. The JUVE Commercial Law Firms noted, that he is "very good to work with and a good lawyer" and "competent and very experienced".

Alexander publishes and speaks regularly at seminars and conferences on copyright and trademark law. He was formerly the Co-Chair of the INTA Bulletin Committee - Policy & Practice Features Subcommittees (INTA - International Trademark Association).