We are the partners of AIQUNITED.

Each and every one of us is an experienced professional within our field. Together, we offer the full range of expertise needed to set up your alternative investment structure: We provide assistance from set-up all the way to exit. The advisory services of AIQUNITED are customized to meet the highest demands of our clients.


Peter Kleingarn

is a tax adviser (Germany) as well as an Expert-Comptable (Luxembourg) with over 20 years of experience in national and international tax law.

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Harald Strelen

is Assessor jur., holds a Master of Laws and a Master of Science in Banking & Finance, and has more than 12 years of international experience.

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Holger Theißen

has more than 20 years of professional experience as a lawyer and tax adviser in the capacity of managing partner at AIQU Law.

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AIQUNITED is a partner-led tax advisory firm (member of the Institute of Luxembourg Chartered Accountants (“Ordre des Experts-Comptables”)) and Directors Office based in Luxembourg. The AIQUNITED  unit AIQU Tax specializes in providing tax advice and tax structuring services as well as in implementing capital pooling structures for illiquid assets. The AIQU Directors Office provides international management services at the highest level especially for banks, insurances, capital management companies as well as liquid and illiquid fund structures.

AIQUNITED is independent and not part of any network. Regarding questions about subject matters outside the scope of Luxembourg’s jurisdiction, we collaborate with our clients’ advisers. Our clients can also benefit from our personal and international network of long-standing business partners. In addition, depending on your preferences, we can coordinate all advisory services, the implementation of our clients’ structures and its management from Luxembourg.


Our clients include financial service providers, financial institutions, private equity and venture capital firms, family offices and high net worth individuals, as well as international industrial corporations from shipping and real estate sectors.

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