[1][2] In 2023, the Hanover public prosecutor's office began investigations into suspicion of delaying bankruptcy at Syntellix and later also into fraud against Claasen.

In 1989 he moved to Ford Europe, where he was responsible for the management control system and worked in a team implementing measures for simultaneous engineering.

[11][12][13][14] While in office, he managed to turn annual losses of over 1 billion euros in 2003 into a record profit for three years in a row, before he left the energy supplier in 2007.

[21][22][23] In addition, Claassen himself received the award as "Most Innovative Entrepreneur International 2016" from the hands of EU Commissioner Günther Oettinger.

[24] While Claassen remains chairman of the board of directors, the company claims to have sold 27.000 "Magnesix" implants worldwide as of March 2017.

[32] In January 2016 he handed the club over to the ACQ Lagacy Partners LLC by transferring 80 percent of its shares within the context of a capital increase by more than 20 million euros.

[1] Besides, Claassen has released numerous scientific publications covering topics such as leadership, knowledge as well as risk management and entrepreneurial innovation.