S&Z Team
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Sina Beecken
Senior Consultant
Sina Beecken
Senior Consultant
Sina Beecken advises German and international clients on developing materiality and benchmarking analyses as well as with sustainability reporting. In addition, she supports clients in conducting Hotspot analyses to identify sustainability risks and opportunities along complex value chains.
Sina Beecken studied Sustainability Science (M.Sc.) at Leuphana University in Lüneburg, where she already completed her B.Sc. in Environmental Sciences and Business Administration. In her studies, Sina Beecken focused on strategic sustainability management and communication. Furthermore, the inter- and transdisciplinary orientation of the study program enabled her to develop holistic approaches to solving complex CR challenges. In her master’s thesis, Sina Beecken dealt with the reduction of the attitude-behavior-gap in online retail through the use digital green nudges.
Sina Beecken gained practical experience during an internship at S&Z. From fall 2018 to 2019, Sina Beecken supported S&Z as an analyst, and from November 2019 to August 2022 as a working student. Sina Beecken worked as a consultant for S&Z from November 2022 to March 2025 and as a Senior Consultant since April 2025.
Sina Beecken speaks German and English.
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Anna Carolina Darboven
Consultant
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Juska Dietrich
Office Manager
Juska Dietrich
Office Manager
Juska Dietrich is our Office Manager for the Hamburg office. Juska Dietrich has been supporting S&Z since 2019 and is the contact person for all questions relating to the back office.
Juska Dietrich speaks German and English.
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Kerstin Domin
Art Director
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Antonia Gärtner
Consultant
Antonia Gärtner
Consultant
Antonia Gärtner advises national and international clients on the identification and management of sustainability risks along complex supply chains.
Antonia Gärtner studied International Economics and Development (B.A.) at the University of Bayreuth in Germany and the University of Bordeaux in France. After her bachelor’s degree, she completed a master’s degree in Philosophy, Politics and Economics (M.Sc.) at the University of Groningen in the Netherlands. In her master's thesis, Antonia Gärtner dealt with the German discourse on the mobility transition and examined how it can be analyzed and advanced by incorporating political-philosophical concepts such as Just Transition and democratic deliberation.
Antonia Gärtner gained practical experience through internships, including at a German automotive group, which she supported in the area of sustainability in supplier management. Between her bachelor’s and master’s degree, Antonia Gärtner worked for a consulting firm in the field of international development cooperation. There she supported projects on impact measurement and multi-stakeholder initiatives in the context of mineral supply chains.
Antonia Gärtner speaks German and English.
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Christopher Haasen
Principal S&Z North America Inc.
Christopher Haasen
Principal S&Z North America Inc.
Christopher Haasen is Principal of S&Z North America Inc. and manages the office in New York. He advises American, German and international clients conducting materiality analyses, strategy development focusing on sustainability, CR report development, and the integration of CR in the supply chain. Additionally, he is an expert in key performance indicators, ESG rating surveys, and CR software, including Enablon.
Christopher Haasen studied at the University of Oxford (UK) and received an M.Sc. in Nature, Society, and Environmental Policy, graduating with distinction. Prior to his studies at Oxford, Christopher Haasen received his Bachelor of Science in Geography and Economics from the University of Southampton (UK) and the Friedrich-Wilhelms University in Bonn.
Christopher Haasen gained professional experience while at the Deutsche Post DHL Group, where he worked at the Innovation Center and with their internal consulting department, DPDHL Inhouse Consulting. Prior to that, Christopher Haasen worked as a student consultant at MarcAurelConsult and developed a growth strategy for a mid-sized media company. Christopher Haasen is co-Inventor of a Europe-wide patented lamp control module.
Christopher Haasen speaks German and English.
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Caitlin Henry
Working student
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Levke Klütz
Human Resources Specialist (currently on parental leave)
Levke Klütz
Human Resources Specialist (currently on parental leave)
Levke Klütz is our HR responsible and is your contact for all questions regarding applications and S&Z as an employer.
Levke Klütz studied International Business Administration (B.A.) with an emphasis on the Hispanophone world and a focus on International Organization & Human Resources at Furtwangen University in Villingen-Schwenningen, Germany. After her bachelor's degree, Levke Klütz completed the Master in Management & Human Resources (M.Sc.) at Leuphana University in Lüneburg, Germany. The interdisciplinary master's program examines HR work from the perspectives of business administration, psychology and law, and also allowed insights into sustainability in HR management and the social dimension of reporting.
During her studies, Levke Klütz was able to gain practical experience in diversity management at AUDI AG and HR support and development at Hamburger Hafen und Logistik AG.
Since May 2023, Levke Klütz has been supporting our team as a Human Resources Specialist and is responsible for HR related activities, such as recruiting, HR development and employee retention.
Levke Klütz speaks German, English and Spanish.
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Aili Lohr
Consultant
Aili Lohr
Consultant
Aili Lohr advises national and international organizations with the detection and management of sustainability risks along complex supply chains and supports with sustainability reporting in accordance with different international standards.
Aili Lohr studied law at Bucerius Law School in Hamburg and at the Northwestern Pritzker School of Law in Chicago. During her studies, Aili Lohr focused on labor law and researched company-internal compensation for damages in her Bachelor’s thesis. Aili Lohr completed her studies with a Bachelor of Laws (LL.B.) in 2020 and the First State Examination in 2022.
Aili Lohr gained professional experience as a research assistant in commercial criminal law, property law and labor law in different full-service law firms in Germany. Additionally, Aili Lohr was a project lead at the student consultancy CIRCLE Consulting from 2021 until 2023 and lead projects concerning sustainability and digital transformation for companies, start-ups, and NGOs.
Aili Lohr speaks German and English.
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Vanessa Müller
People & Culture Generalist
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Manfred Richter
Communication Expert
Manfred Richter
Communication Expert
Manfred Richter is always at the service of S&Z for ambitious communication cases. He ensures that the conceptualization and implementation of reporting projects are geared toward target groups.
As an economics graduate, he worked for about 20 years in corporate communications for various corporations. Since 2009, he, along with Claus-Martin Carlsberg, has led the agency Carlsberg & Richter in Munich. Previously, he oversaw BMW Group’s Department of Consolidated Statements, Corporate Publications, and Sustainability.
With his professional experience, he is a competent point of contact for all questions of corporate communications - from basic communication strategy and design to actual implementation. As an expert in corporate and financial publications, he ensures above all that texts and stylistic aspects are reflective of the specific target group. This creates strategies and communication schemes which can be seamlessly integrated into existing structures and will always perform in the best interests of the company.
The communication of sustainability is one of the priorities of Manfred Richter’s work: “No topic is so multifaceted and complex as this. In the long run, only companies with credible, understandable, and stakeholder-oriented content will be successful in their communications. The cooperation of sustainability experts and communication experts provides the perfect conditions for this.“
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Anna Romio
Consultant
Anna Romio
Consultant
Anna Romio advises German and international clients on sustainability reporting, the evaluation of their sustainability performance along the supply chain, as well as on hotspot analysis and stakeholder communication.
Anna Romio studied Foreign Languages and Civilisations (B.A.) with a minor in Business Administration at the University of Trento, Italy. After her bachelor’s degree, Anna Romio completed her master’s degree in International Business and Sustainability (M.A.) at the University of Hamburg. The interdisciplinary background of the program was meant to focus on integrating sustainability and innovation into value chains, as well as circular economy, and climate change. In her master’s thesis, Anna Romio investigated the potential of blockchain as fostering sustainability along agricultural supply chains, as well as in the wind energy, fintech, and public sectors.
After her studies, Anna Romio completed an internship at S&Z, where she advised companies in the automotive industry and federal public agencies in the agriculture sector. Furthermore, Anna Romio gained professional experience in the agricultural sector through project work for a company in Italy, and in the real estate industry in London. Anna Romio was also involved in pro-bono consulting projects with the Hamburg office of 180 Degrees Consulting, the world’s largest student consultancy for environmental and social impact start-ups.
Anna Romio speaks German, English, Spanish and Italian.
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Cathleen Sanner
Intern
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Sebastian Schaarschmidt
Principal
Sebastian Schaarschmidt
Principal
Sebastian Schaarschmidt supports national and international clients in implementing and using CR software, as well as in the development of sustainability and climate change adaptation strategies. His areas of expertise include developing materiality analyses and sustainability performance indicators.
Sebastian Schaarschmidt received his Bachelor of Arts in Business Administration from the University of Hamburg, where he focused on statistical modeling. He also holds a Bachelor of Science in Environmental Science from Leuphana University in Lüneburg, specializing in sustainability management. As part of his bachelor's thesis, he analyzed climate change as a risk factor for companies.
Prior to joining S&Z, Sebastian Schaarschmidt gained professional experience in the logistics department of a wholesaler, where he was responsible for data analyses, as well as in an industrial company. Furthermore, he added to his scientific expertise with an internship in a research institute.
Sebastian Schaarschmidt speaks German and English.
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Joachim Schlange
Senior Advisor
Joachim Schlange
Senior Advisor
Joachim Schlange is Co-Founder and until the end of 2023 was Managing Partner of Schlange, Zamostny & Co. GmbH and President of S&Z North America Inc.
As Managing Director at Systain Consulting GmbH, a subsidiary of the Otto Group, Joachim Schlange built up the CR consultancy in 2002. As a spin-off, he co-founded S&C in 2006. Between 2000 and 2002, he was Managing Director of Tiscali Germany, a subsidiary of the Italian Tiscali S.p.A., which at that point was one of the leading European internet service providers. Prior to that, from 1990 to 1999, Joachim Schlange was Associate Partner and Co-Head of the global Transportation Competence Center at Roland Berger Strategy Consultants in Germany. Between 1982 and 1990, he was Director and Vice-President of Investment Banking at Deutsche Bank AG in Frankfurt, London, and Lisbon.
Joachim Schlange gained his first experiences during his time in New York as an investment banker at J.Henry Schroder from 1978 to 1982. He graduated from Fordham University’s Gabelli School of Business with an MBA in 1982.
Joachim Schlange is married and has 3 daughters. He has been a member of the Board of Trustees for the Katrin Rohde Foundation in Germany and in the USA since 2008. Furthermore, he has been a member of the Sustainability Committee of the Hamburg Chamber of Commerce since 2015.
Joachim Schlange speaks German (native language) and is fluent in English and Portuguese.
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Matilde Schlange
Consultant
Matilde Schlange
Consultant
Matilde Schlange advises German and international clients on sustainability reporting and the assessment of their sustainability performance. Her competencies include concept development for materiality analyses, climate strategies, and the preparation of CO2 footprints.
Matilde Schlange studied Business Administration and Economics (B.Sc.) with a major in Finance at the University of Passau and Bocconi University in Milan, and holds a M.Sc. in International Management from Esade Ramon Llull Business School in Barcelona. As part of her master's degree, Matilde Schlange advised two Spanish NGOs on the topic of impact management and helped them establish a Theory of Change, as well as define appropriate impact metrics. Her master's thesis focused on impact investing, where Matilde Schlange analyzed what kind of impact different investor syndicates have on social enterprises.
Prior to her master's degree, Matilde Schlange worked as an analyst at Deutsche Investitions- und Entwicklungsgesellschaft (DEG, a subsidiary of the KfW Group), where she was involved in private equity investments in Africa, managing a portfolio of approximately € 200 million and assisting in various new investments. Her first practical experience was previously gained in various internships in project financing of renewable energies in emerging markets, as well as in financial advisory at a global auditing and consulting firm.
Matilde Schlange speaks German, English and Portuguese.
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John Serrano
Senior Consultant
John Serrano
Senior Consultant
John Serrano advises American and international clients on their sustainability strategy development, including stakeholder engagement, materiality analyses, and CR reporting. He is also an expert in ESG ratings and sustainability communications.
John Serrano holds a Master of Sustainability Leadership from Arizona State University, specializing in sustainability strategy development. Prior to this, John Serrano received his Bachelor of Science in Renewable Natural Resources from Texas A&M University, focusing on strategies for ecosystem management and restoration.
He gained professional experience while at the Vinyl Institute in Washington, DC, where he co-led the development of the industry’s sustainability and communications strategy. Prior to that, John Serrano worked for the U.S. House Committee on Science, Space and Technology where he helped manage Congressional oversight of the nation’s non-defense research and development portfolio.
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Lisa Tran
Junior Consultant
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Andreas Zamostny
Managing Partner
Andreas Zamostny
Managing Partner Schlange, Zamostny & Co. GmbH
Vice-president S&Z North America Inc.Andreas Zamostny is Co-Founder and Managing Partner of Schlange, Zamostny & Co. GmbH, as well as Vice-president of S&Z North America Inc.
Since 2000, Andreas Zamostny has supported dozens of organizations to develop more sustainable processes and products: first as sustainability manager at Otto Group in Hamburg, and from 2005 as senior consultant at the Otto subsidiary Systain Consulting.
In the fall of 2006, he co-founded the consulting company Schlange & Co. with Joachim Schlange.
Andreas Zamostny’s sustainability expertise is built upon his studies in Environmental Sciences, which he completed at the Van Hall Institute in the Netherlands between 1995 and 1999, as well as in a study visit at the Institute for Sustainable Futures – part of the University of Technology in Sydney, Australia – and at Coventry University in Coventry, UK.
The Rio Conference in 1992, the book “The Limits to Growth,” and his personal experience of environmental pollution in Eastern Germany, were pivotal in his career choice.
Outside of his consulting work, Andreas Zamostny is dedicated to developing and transferring knowledge, as well as sharing experiences of how businesses can become more sustainable. He regularly presents at universities, colleges, and student initiatives, as well as participates in debates.
Andreas Zamostny speaks German, English, and Dutch.
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Carolina Zarta
Consultant
Carolina Zarta
Consultant
Carolina Zarta supports North American and international clients with the assessment of their sustainability performance, the development of materiality analyses, sustainability performance indicators and reporting, hotspot analyses in the value chain, as well as with conducting stakeholder surveys.
Carolina Zarta studied Sustainability Management (M.Sc.) at Columbia University in the City of New York. During her studies, she focused on corporate sustainability, analyzing opportunities to integrate sustainability into value chains, clean energy, and climate change. In her master’s capstone, Carolina Zarta worked with the UNDP Inclusive Development and Growth (IDG) on competencies and traits for the achievement of the United Nations’ Sustainable Development Goals (SDGs). Prior to that, Carolina Zarta received her bachelor’s degree (B.E.) in Industrial Engineering from Universidad de los Andes in Bogotá (Colombia). In her bachelor’s thesis, she analyzed sustainable agriculture practices as a business case.
Carolina Zarta gained professional experience through previous strategy consulting and project work in the private sector in Colombia working with the IT industry, financial services, and logistics and transportation. She was also actively involved in pro-bono research and consulting projects with diverse student groups while she studied at Columbia University.
Carolina Zarta speaks Spanish and English.
