Company Management

Management Teams Viessmann Group

Personal responsibility is one of our management principles at Viessmann. We expect our managers to lead by example. Our purpose is to create living spaces for generations to come. 

Family Holding

Laying the foundation for generations to come

In the 103rd year of our company’s history, we repositioned ourselves with the Viessmann Family Holding and laid the foundation for generations to come. In this way, we are ensuring the company’s independence for the long term and the active involvement of the owner family over generations. The holding is managed by the Board of Directors.

Prof. Dr. Martin Viessmann

Professor Dr. Martin Viessmann

Chairman of the Board of Directors

Professor Dr. Martin Viessmann joined his father's company in 1979. He became a member of the management board in 1984 and commercial director in 1989. At the turn of the year 1991/92 he succeeded his father, Dr. Hans Viessmann, in the 3rd generation. Professor Dr. Martin Viessmann developed the company into a leading international manufacturer of climate and energy solutions. Since his son Maximilian took over the operational business in 2018, Professor Dr. Martin Viessmann has held the position of Chairman of the Board of Directors. Professor Dr. Martin Viessmann was born in 1953, is married and has two children.

Executive Members of the Board of Directors

Operationally, the Family Holding is managed by a three-member Executive Board. Maximilian Viessmann is represented on the Board as a member of the owner family. As Co-CEO, he manages business operations together with Co-CEO Joachim Janssen. Chief Financial Officer Dr. Ulrich Hüllmann completes the management team.

Maximilian Viessmann

Maximilian Viessmann

Co-CEO Viessmann Group

In 2018, Professor Martin Viessmann’s son Maximilian took over the management of the company as Co-CEO, together with Joachim Janssen. The industrial engineer and management consultant has been active in the company since 2015. Both privately and professionally, he feels fulfilled by making a contribution for generations to come. In addition to the digital and cultural transformation of the Group, Max Viessmann is driving forward the further development of the heating and climate business. Through the values “responsible”, “team-oriented”, and “entrepreneurial”, the family-owned company expresses how it puts people front and center and continually invests in the development and the diversity of the 12 300 members of the large Viessmann family. Maximilian was born in 1989, is married, and has one son.

Joachim Janssen

Joachim Janssen

Co-CEO Viessmann Group

Joachim Janssen joined Viessmann at the beginning of 2007. The graduate in business administration and economics (Diplom-Kaufmann) initially took on the role of Chief Financial Officer. From 2015 to 2018, he initially led the company in a dual role as Co-CEO with Professor Dr. Martin Viessmann and Chief Digital Officer. Joachim was born in 1957 in Jüchen. The amateur photographer likes to cook and loves his garden. He is married and has two grown children.

Ulrich Hüllmann

Dr. Ulrich Hüllmann

Chief Financial Officer

Since joining the company in 2015, the doctor of business administration has been CFO of the Viessmann Group. Prior to this, he worked for GEA Farm Technologies for nine and a half years, most recently as CEO. His motto: “It’s all about people.” Ulrich was born in 1968, is married, and has three children. Playing sports with friends is very important to him.

Non-Executive Members of the Board of Directors

The entrepreneurial personalities in the Board of Directors actively support the Executive Board with advice and ideas, oversee its work, and ensure high standards of corporate governance and corporate responsibility.


The Board of Directors consists of the following non-executive members:


  • Prof. Dr. Thomas Rödder (Deputy Chairman)

  • Katharina Viessmann

  • Madeleine Jahr

  • Dr. Albert Christmann 

Climate Solutions

Our climate solutions let us create living spaces of the very highest quality. These not only ensure optimum indoor temperature, hot water, energy, and good air quality but also the best possible level of comfort. Our solutions are as efficient as they are sustainable. This is how we set the standards in heating and climate technology. This business area is the responsibility of the members of our Executive Board Climate Solutions.

More about Viessmann Climate Solutions >

Maximilian Viessmann

Maximilian Viessmann

Chief Executive Officer

In addition to his position as Co-CEO of the Viessmann Group, Maximilian Viessmann has also been CEO of the Climate Solutions business area since July 2019. 

Dr. Ulrich Hüllmann

Dr. Ulrich Hüllmann

Chief Financial Officer

Alongside his role as CFO of the Viessmann Group, since July 2019 Dr. Ulrich Hüllmann has also been in charge of the Finance department in the Climate Solutions business area.

Asa Lautenberg

Åsa Lautenberg

Chief People Officer

Since November 2019, Åsa Lautenberg has led the People & Organization department. She previously worked for the Lufthansa Group among others, most recently as Head of Corporate HR & People Strategy. Åsa was born in 1969 in Gothenburg, Sweden. Her motto: “If you don’t dream of flying, you won’t grow wings.”

Dr. Markus Klausner

Dr. Markus Klausner

Chief Technology Officer

Dr. Markus Klausner has been CTO since July 2019. Prior to this, he was CTO for Viessmann Heizsysteme for more than three years. After completing his doctorate at Carnegie Mellon University in Pittsburgh, he started his career in 1998 as a development engineer for Robert Bosch Corp. (USA). Before joining Viessmann, Markus was head of development for electric and hybrid vehicle drive systems at Bosch. He was born in 1973 in Chemnitz and was a competitive swimmer in his youth. He likes cycling and jogs regularly.

Thomas Heim

Thomas Heim

Chief Sales Officer / Chief Marketing Officer

As CSO of Viessmann Heizsysteme, Thomas became a member of the large Viessmann family in 2017. Since 2020, he has been responsible for sales, marketing, and service in the Climate Solutions business area. A guiding principle that inspires him comes from Nelson Mandela: “I never lose. I either win or learn.” In his personal interpretation, he always translates the “I” to the “we” of his team, since a team focus is a fundamental value for him. Thomas was born in 1968 and loves mountaineering and skiing.

Refrigeration Solutions

With our comprehensive range of refrigeration systems, we offer intelligent solutions for commercial users. Viessmann Refrigeration Solutions set themselves apart through sophisticated technology, a high level of energy efficiency, above-average hygiene properties, and excellent user convenience. This business area is the responsibility of the members of our Executive Board Refrigeration Solutions.

More about Viessmann Refrigeration Solutions >

Frank Winters

Frank Winters

Chief Executive Officer

Frank Winters has been head of the Refrigeration Solutions business area since October 2017. He gained many years of experience in refrigeration technology at Carrier, most recently as General Manager Northern Europe. His motto: “Life is full of surprises, but there are no guarantees.” Frank was born in the Netherlands in 1970, is married, and has three sons. In his free time he likes playing soccer. He enjoys skiing and snowboarding, and spending time with his family.

Michael Luz

Michael Luz

Chief Financial Officer

Michael Luz has been part of the Viessmann family since 2004. After holding various positions, including Managing Director of Viessmann Kraft-Wärme-Kopplung GmbH, the graduate in business administration (MBA) and engineering (BA) took over the role of CFO for the Refrigeration Solutions business area at the beginning of 2017. Michael was born in 1977 and lives with his family near Munich. He enjoys spending his free time with his family in the mountains.

Joachim Schlichtig

Joachim Schlichtig

Chief Technology Officer

Joachim Schlichtig joined the Viessmann Group in 2010 and gained a lot of experience abroad, most recently as Managing Director of our plant in Porvoo, Finland. He has been CTO in the Refrigeration Solutions business area since July 2020. Joachim, born in 1963, loves classical music and sings as a tenor in a German-Finnish church choir in Helsinki. He is married and has two children.

Udo Laeis

Udo Laeis

Chief Sales Officer

Udo Laeis has been CSO in the Refrigeration Solutions business area since July 2020, where he is responsible for all sales, distribution, and service organizations. He has more than 25 years of experience in refrigeration technology. Udo was born in 1967. Most of all he likes spending his free time with his family outdoors. He is a passionate skier. His motto: “Think positively and enjoy what you do.”

Industrial Solutions

Viessmann develops and implements integrated energy concepts for industry and trade. Our efficient energy systems and plants make an important contribution to reducing operating costs and pollutant emissions. Viessmann offers comprehensive system solutions and the option of using all energy sources. This business area is the responsibility of the Chief Executive Officer Joachim Janssen.

More about Viessmann Industrial Solutions >
Joachim Janssen

Joachim Janssen

Chief Executive Officer

In addition to his position as Co-CEO of the Viessmann Group, Joachim Janssen also manages the business of the Industrial Solutions business area.

Viessmann Investment

To prepare for the future with its changing global environment, we are tapping further growth potential through targeted acquisitions. We offer the opportunity to interested entrepreneurs, to branch into new regions and markets with us. The Viessmann Investment business area considers itself as a "company for entrepreneurs". In concrete terms, this means the sustainable, partnership-based further development of portfolio companies with considerable entrepreneurial freedom. This business area is the responsibility of the Viessmann Investment Board.


More about Viessmann Investment >

Timo Tauber

Timo Tauber

Managing Director

As Managing Director, Timo is responsible for the Investment business area and the M&A activities of the Viessmann Group. Before joining Viessmann in 2016, Timo gained many years of transaction experience in the technology sector, working for, among others, a private equity fund and as a lecturer at the Frankfurt School of Finance & Management. Timo was born in 1980 and tries to improve his performance on his racing bike all year round. 

VC/O

Digitalization creates new challenges for us that we boldly take up. With our digital unit VC/O, we not only monitor developments but actively shape them and secure potential for the future. We invest in start-ups and new business models. The diversification business unit VC/O is managed by a two-person management board.

More about VC/O >

Prof. Dr. Markus Pfuhl

Prof. Dr. Markus Pfuhl

Managing Director

Professor Dr. Markus Pfuhl has been a member of the Viessmann family since 2003, where he worked in IT and corporate development. In the role of Chief Digital Officer from 2017 to 2020, he was responsible for the digital transformation of the company. Markus was born in 1973 and enjoys making music in his free time. Since 2020, he has been Chief of Staff & Strategy in the Family Holding, alongside his work in VC/O.

Tobias Rappers

Tobias Rappers

Managing Director

Graduate in business administration (MSc) Tobias Rappers, who previously worked for seven years as a management consultant in the digital sector at Roland Berger and as Managing Director of the innovation hub “Spielfeld” of Roland Berger and Visa Inc., has been Managing Director of Maschinenraum and VC/O, the innovation ecosystem of the Viessmann Group, since August 2019. Tobias, born in 1986, is an enthusiastic skier and kite surfer.

Viessmann Real Estate

Viessmann Real Estate manages our properties as well as our hotels and restaurants. We operate four hotel and restaurant businesses close to our company headquarters in Allendorf/Eder, which are available to our customers, partners, employees, and guests from the region. The diversification business unit Viessmann Real Estate is managed by a two-member management board.

More about Viessmann Real Estate >

Klaus Kümmel

Klaus Kümmel

Managing Director

University-qualified engineer (Diplom-Ingenieur) Klaus Kümmel has been a member of the Viessmann family since 1992. He started as a project manager in the Construction department, which he later headed for many years. He has been Managing Director of Viessmann Real Estate since January 2020. The passionate skier and motorcyclist was born in Dortmund in 1959. Most of all he likes to spend his free time with his family and friends.

Jörg Lenz

Jörg Lenz

Managing Director

Jörg Lenz has been a member of the Viessmann family since 1979 and is an authorized signatory and Managing Director of many companies of the Viessmann Group. In addition, he has been teaching courses in balance sheet accounting at the Volkshochschule Waldeck-Frankenberg adult education center for more than 30 years. He is also head of the family office, tax, and other real estate activities at the holding company level. Jörg is married and has two children and three grandchildren.

Foundation activities

Viessmann Foundations activities

Creating living spaces for generations to come – the purpose of the Viessmann Group is also groundbreaking for the social commitment of the family business. For us as a family-owned company, social commitment and entrepreneurial action have been inseparably linked since the company was founded. This applies to the Viessmann Foundation (in formation), which is clearly focused on the Viessmann Purpose, as well as to the Viessmann Allendorf Foundation, the Hans Vießmann Technologie Foundation and the Dr. Hans Vießmann Foundation.

More about our foundation activities >

Jörg Lenz

Jörg Lenz

Managing Director Viessmann Foundation gGmbH (in formation)

In addition to his position as Managing Director of the Viessmann Real Estate business area, Jörg is also Managing Director of the Viessmann Foundation gGmbH (in formation).

Prof. Dr. Markus Pfuhl

Prof. Dr. Markus Pfuhl

Managing Director Viessmann Foundation gGmbH (in formation)

In addition to his activities as Chief of Staff & Strategy of the Family Holding and Managing Director of the VC/O Business Area, Markus is also Managing Director of the Viessmann Foundation gGmbH (in formation).