Seig has over 25 years of experience with Family Offices, starting with Cazenove & Co., where for 12 years he looked after Family Office funds and companies, and built relationships with over 500 families.
 
In 2000, Seig founded Debrecks Marketing. Through the Family Office network in Europe, the Middle East, the Far East and Australia, Debrecks offers an introductory service either one-to-one, or a full marketing campaign.
 
Debrecks Marketing has raised in excess of US$4 billion for various investment strategies, including ABL, European long/short, MENA long/short, Africa funds, global macro, long only boutiques, Multi-managers (UK), Fund of Funds, Green Funds, and Private Equity.
 
In 2004, Seig founded a service to visit and meet with the family offices of Australia and the Super Funds (Pension Funds). In excess of 20 managers representing different strategies have visited and raised money, also seed capital for new and small businesses successfully undertaken – fashion, healthcare, peer to peer lending, advertising and disruptive ideas are a specialism.
 
In 2005, Seig also founded the European Family Office Investment Forum. He launched the first Leadership Summit and Investment Summit in London and continues to run these events with Incisive Media. The events have become increasingly successful in terms of numbers (over 300 families attend each event), and in terms of raising money for different ideas and funds through presentation to the Family Office audience.
 
In 2011, Seig was appointed Chairman of FMG Eurasia, which specialises in frontier funds, Iraq, MENA, Russia, China, India and Africa. As Chairman, Seig also facilitates distribution in Europe for FMG.