Our employees

Prof. Dr.-Ing. Jan Uwe Lieback is lead environmental and quality auditor, verifier and CEO of GUTcert. His special interest is to make certifications with many tips and recommendations of highly qualified auditors to an additional benefit for all customers. Certifications are also customer service!

Tel.:   +49 30 536062-3
Mobil: +49 172 3020700
E-Mail: jan.lieback(at)gut-cert.de

Dipl.-Physicist Andreas Lemke is head of our certification body, lead quality auditor and authorised signatory of GUTcert. He coordinates the execution of all procedures, offers advice on matters relating to certification and is "responsible anyway."

Tel.:   +49 30 536062-41
Mobil: +49 172 3020715
E-Mail: andreas.lemke(at)gut-cert.de

Jochen Buser is head of the areas emission trading / energy services and authorized signatory of GUTcert. He is a graduate environmental scientist from the University of Lüneburg.

Tel.:   +49 30 536062-42
Mobil: +49 172 3010650
E-Mail: jochen.buser(at)gut-cert.de

Doreen Gnebner is product manager for energy management systems and the "Qualiätsmanagementbeauftragte" of GUTcert. She has a degree in industrial engineering from the technical and economic Fachhochschule Berlin.

Tel.:   +49 30 536062-54
Mobil: +49 172 3058053
E-Mail: doreen.gnebner(at)gut-cert.de

Matthias Elvert is head of Occupational Safety / OHSAS and project engineer for the areas of emission trading and energy services.
He has a degree in process engineering and environmental engineering from the Technical University Berlin.

Tel.:   +49 30 536062-46
Mobil: +49 172 3058052
E-Mail: matthias.elvert(at)gut-cert.de

Viola Hohn is a graduate in business administration and executive assistant since October 2008. As team assistant, she also assists organising the GUTcert internal processes.

Tel.: +49 30 536062-3
E-Mail: viola.hohn(at)gut-cert.de  

Thomas Gebhardt is industrial engineer with focus on environment. He coordinates projects in the fields of energy and emission trading.

Tel.: +49 30 536062-55
E-Mail: thomas.gebhardt(at)gut-cert.de

Sabine Schumacher coordinates projects in the field of CO2-balances, Corporate and Product Carbon Footprints. Furthermore she is contact person for Water Footprints. She studied Environmental engineering at FH Lübeck and Industrial Environmental Computing at HTW Berlin

Tel.: +49 30 536062-57
E-Mail: sabine.schumacher(at)gut-cert.de

Peter Behm is responsible for the certification of sustainable biomass and for product development. He studied business administration at the HTW Berlin with the key areas environmental management and finance & investment.

Tel.: +49 30 536062-53
E-Mail: peter.behm(at)gut-cert.de

Sindy Prommnitz is graduate engineer (FH) for landscape architecture and environmental planning and in the GUTcert as product manager for environmental management systems. She coordinates projects in the areas of quality and environmental management, occupational safety, and projects within the framework of international co-operation with AFNOR.

Tel.: +49 30 536062-45
E-Mail: sindy.prommnitz(at)gut-cert.de

Doreen Petry is graduate in business administration, specializing in management and marketing SMEs. She joins the team and the GUTcert since mid-2010 as contact person for the area AZWV.
Tel.: +49 30 536062-40
E-Mail: doreen.petry(at)gut-cert.de

Anika Dreisbach studied Oecotrophologie at HS Fulda and works since March 2011 as project coordinator in the fields of energy management and sustainable biomass for the certification body of GUTcert. 

Tel.: +49 30 536062-50
E-Mail: anika.dreisbach(at)gut-cert.de

David Kroll graduated with a degree in economics at the Technical University of Berlin with a focus on environmental and resource economics. Since March 2011 he has been with the GUTcert as project assistant in the field of emissions trading.

Tel.: +49 30 536062-46
E-Mail: david.kroll(at)gut-cert.de

Susanne Moosmann is project manager in the field of sustainability at GUTcert since June 2011. She studied Oecotrophology at HS Fulda and has a master degree in sustainability and quality management.
Tel.: +49 30 536062-54
E-Mail: susanne.moosmann(at)gut-cert.de

Sven Odens is project assistant  in the field of Carbon Footprint since August 2011.
he studied Economics at the University of Applied Science Bremen.
Before he joined the Carbon Footprint team he worked at a consultancy.

Tel.: +49 30 536062-57
E-Mail: sven.odens(at)gut-cert.de

Almut Lieback is since September 2011 contact for the website of GUTcert and all topics around business communications. She studied social and business communication at the Berlin University with focus on text and communications planning.

Tel.: +49 30 536062-59
E-Mail: almut.lieback(at)gut-cert.de

Yulia Felker is a graduate in economics and environmental management. Since July 2011 she works in the field of sustainability at GUTcert.

Tel.: +49 30 536062-54
E-Mail: Yulia.Felker(at)gut-cert.de


Maria Schmidthermes is since May employee of the GUTcert. She is responsible for certification in the Food and Agricultural sector and supports the area of ​​sustainable biomass. She is B.Sc. in environmental sciences and M.Sc. in environmental and resource management.

Tel.: +49 03 536062-53
E-Mail: maria.schmidthermes(at)gut-cert.de

Henrik Netzow studied educational science with a focus on adult and continuing education at the University of Bielefeld. After graduation, he worked as coordinator for EU projects in the field of labor and social policy. Since October 2011 he is with GUTcert in the field AZWV.

Tel.: +49 30 536062-40
E-Mail: henrik.netzow(at)gut-cert.de

Martina Sommer is a graduate communications specialist and event manager. Since August 2011 she works in the GUTcert Academy.

Tel.: +49 30 536062-44
E-Mail: martina.sommer(at)gut-cert.de



AFNOR Groupe