Michalakis Zambellas (Greek: Μιχαλάκης Ζαμπέλας ) is a Cypriot politician and businessman.
 He was the Mayor of Nicosia and also the General Manager of PricewaterhouseCoopers Cyprus.
Multidisciplinary professional services networks are organizations formed by law, accounting and other professional services firms to offer clients new multidisciplinary approaches solving increasingly complex issues.
 They are a type of professional services network which operates to provide services to their members.
 They operate in the same way as accounting firm networks and associations and law firm networks.
 They do not practice a profession such as law or accounting but provide services to members so they can serve clients needs.Aim is to provide members involved in doing business internationally with access to experienced, tried and tested, reliable, and responsive professional advisers who know their local jurisdiction intimately as well as the intricacies of cross border business.
PricewaterhouseCoopers (doing business as PwC) is a multinational professional services network headquartered in London, United Kingdom.
 It is the second largest professional services firm in the world, and is one of the Big Four auditors, along with Deloitte, EY and KPMG.
 Vault Accounting 50 has ranked PwC as the most prestigious accounting firm in the world for seven consecutive years, as well as the top firm to work for in North America for three consecutive years.
EY (formerly Ernst & Young) is a multinational professional services firm headquartered in London, England.
 EY is one of the largest professional services firms in the world and is one of the "Big Four" accounting firms.
PwC is best known as PricewaterhouseCoopers, a multinational professional services network.
Arup (officially Arup Group Limited) is a multinational professional services firm headquartered in London which provides engineering, design, planning, project management and consulting services for all aspects of the built environment.
 The firm has over 14,000 staff based in 92 offices across 42 countries, and is present in Africa, the Americas, Australasia, East Asia, Europe and the Middle East.
 Arup has participated in projects in over 160 countries.
TMF Group is a multinational professional services firm headquartered in Amsterdam, the Netherlands.
 The independent group provides accounting, tax, HR and payroll services to businesses operating on an international scale.
 TMF Group employs more than 6,000 staff and has 100 offices in over 80 jurisdictions.
WSG, also branded as World Services Group, is a multidisciplinary professional services network of independent law, accounting and investment banking firms.
 It ranks as one of the largest among the more than 200 professional services networks in the world.
 WSG members are independent law, accounting and investment banking firms.
 According to the organization's website as of 2016 , WSG was formed in 2002 as a multidisciplinary network with the objective of bringing together professionals in a professional services network that creates business opportunities and relationships to better service their clients globally.
 Its members have more than 19,000 professionals in more than 115 countries in almost 400 offices.
 Its global headquarters are located in the Houston, Texas,
CACI International Inc, is an American multinational professional services and information technology company headquartered in Arlington, Virginia, United States.
 CACI provides services to many branches of the federal government including defense, homeland security, intelligence, and healthcare.
gkkworks is a multinational professional services firm headquartered in Irvine, California, United States which provides architecture, interior design, planning, construction, construction management, program management, and design-build services for all aspects of the built environment.
< Markets include K-12 and higher education, healthcare, hospitality, commercial, government, and critical facilities.
 The firm has offices in the United States (Irvine, Pasadena, Riverside, San Diego and Denver); and India (Pune).

Question: Michalakis Zambellas is the General Manager of a multinational professional services network headquartered in what city?
Answer: London