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Managing Directors



Alexa Hergenröther


Alexa Hergenröther

Graduated Business Economist

Chairperson of the Executive Management of K+S KALI GmbH
born 1970; married; two children
joined K+S in 2002

Marketing and Sales

Alexa Hergenröther was born in Malsch (Baden-Württemberg) in 1970. She studied business administration at the University of Mannheim. After graduating in 1997, she joined auditors Deloitte & Touche in Hanover as a trainee and worked afterwards as audit manager and project manager. At the same time, she prepared to qualify as a tax advisor, successfully completing the examination in 2002. In the same year, Alexa Hergenröther moved to Kassel to join the K+S Group. Initially she worked as a taxation specialist and in 2006, she was appointed to head the holding company’s corporate development unit. In January 2012 she assumed the position of Managing Director of K+S Chile S.A. (formerly Sociedad Punta de Lobos S.A.). She has been appointed to the Executive Management of K+S KALI GmbH with effect from 1 June 2014. Alexa Hergenröther is married and has two daughters.



Bastian Siebert


Bastian Siebert

Business Economist (VWA)

Managing Director of K+S KALI GmbH
born 1981; married; two children
joined K+S in 2001

Production and Technology

Bastian Siebert was born in 1981 in Kassel. Parallel to his training as an industrial manager at K+S Aktiengesellschaft, he graduated in business administration at Verwaltungs- und Wirtschaftsakademie in Kassel as a business economist (VWA) in 2004. Then, until 2008, Bastian Siebert worked as Head of Supply Chain Performance Evaluation at fertiva GmbH in Mannheim (K+S Group at that time, now EuroChem Agro). Then, until 2009, he took over the lead of Project Management Logistic at K+S Aktiengesellschaft in Kassel up to when he was assigned to lead Logistic Procurement Rail, Inland Navigation, Storage and Handling until 2012. Mr. Siebert moved to K+S KALI GmbH in 2013 and assumed control of Supply Chain Execution for two years and until the end of 2016, Supply Chain Distribution. Before he was appointed to the Executive Management of K+S KALI GmbH with effect from 1 September 2018, he was responsible for and controlled the global sales and marketing activities of the K+S product range for food, feed and pharma purposes as well as for industrial customers as VP Head of Commercial Unit Life Science & Additives. Bastian Siebert is married and has two children.


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