Ad van Tiggelen

Ad van Tiggelen (Maastricht, 7 June 1958) is an author of fantasy novels using the pen name Adrian Stone.
Career.
Van Tiggelen studied business economics at the Erasmus University Rotterdam and in 1981 started his career at Nationale-Nederlanden, where he became investment manager in 1988. 
Since then he moved through a series of investment jobs at ING Groep, including a long period as head of European equities. In the end, he worked as investment strategist, in which function he regularly appeared in national and international media to comment on developments in the financial markets and to express and explain the vision of ING Investment Management. He ended his career with ING on 30 June 2014.
Columns.
Van Tiggelen wrote columns every month about a series of investment topics. These columns appeared in the Netherlands in FD.nl and in various financial media in other countries: Belgium, France, Spain, Italy, Germany, Greece and Poland.
Author.
Since his youth Van Tiggelen had a passion for fantasy literature, which led him to write fantasy novels himself.
In 2006 his first book "Devil's Prophet" appeared in a limited edition at Gopher publishers. In 2008 he signed a contract with Luitingh-Sijthoff, the Netherlands' largest publisher of speculative fiction and fantasy, on which basis Luitingh-Sijthoff re-published "Devil's Prophet" in April 2009, followed in June 2009 by "Devil's Son".
The third part of the Devil trilogy, "Devil's Soul", appeared in April 2010. All books are published under the pseudonym Adrian Stone.
After the Devil Trilogy Stone wrote the "Rune" Duology. The first part "The Eighth Rune" was published in September 2011, the second part "The First God" in September 2012.
At the moment Stone is writing the second part of a new series (title: "Magycker"), which is situated in a completely new world. The first part "The Claw" was published in 2016.