Our team
S+ GmbH is a team of dedicated experts who utilize their passion, creativity, and expertise to develop innovative solutions for your sustainability reporting and strategy. Our diverse team of professionals offers a range of experiences and perspectives, enabling us to develop innovative and tailored solutions for your company. We assist you in addressing future challenges in a prudent and time-efficient manner. Get to know us better!
Dr. Martin Ritter
CEO
Expertise: sustainable business models, sustainability strategy, sustainable value chains
Fields of application: Mobility, medical technology, sharing economy, apiculture
Languages: German, English
Lectures and projects (selection):
Teaching University of Applied Sciences Rottenburg (since 2023): Module Governance and Network Economics (B.A. Sustainable Regional Management)
Lecture Master Environmental Governance 2021: ‘Business model for sustainability – innovate entrepreneurship as driver of transformation?’
Project: Potentials of Honey/Wax Value Chain in Nono Sale (Ethiopia). Increasing farmers‘ and producers’ income through organic-certified beeswax production. (On behalf of GIZ Programme ‘Sustainable Agricultural Supply Chains and Standards’).
Publications (selection):
Lammert, Ritter et al. 2024 The Impact of the Corporate Sustainability Reporting Directive (CSRD) on Software Companies – a survey (in press)
Ritter et al. 2023: Mobility transition or just another business? Temporal and spatial analysis of the diffusion of station-based carsharing services in five German municipalities. Spatial Research and Planning 81 (4)
Ritter und Hampe (2019): Lokal und digital. Geschäftsmodellentwicklung von Nachbarschaftsplattformen und -apps im deutschsprachigen Markt. ZEE Working Paper
Ritter and Schanz (2019): The sharing economy: A comprehensive business model framework, Journal of Cleaner Production 213.
Ritter et al. (2019): The African Way: Healthy Bee Colonies and Sustainable Income Maintenance. American Bee Journal 159 (5).
Ritter and Hampe (2019): Local and digital. Business model development of neighbourhood platforms and apps in the German-speaking market. ZEE Working Paper (only available in German)
Emma Gothár
CEO
Expertise: Circular economy, circular supply chains, sustainability management
Fields of application: Plastics, packaging, medical technology
Languages: German, English, Hungarian
Lectures and projects (selection):
Gothár, E., Schanz, H., 2024. Dynamics in the evolution of circular sourcing strategies: Evidence from German frontrunners sourcing for recycled plastics. J. Clean. Prod. 435, 140561. https://doi.org/10.1016/j.jclepro.2024.140561.
Gothár, E., & Schanz, H. (2022). Bringing a governance perspective to plastic litter: A structural analysis of the German PET industry. Sustainable Production and Consumption 31, 630-641. https://doi.org/10.1016/j.spc.2022.03.019
Winner of the People’s Choice Award of the Three Minute Thesis Competition (2019). Graduate School Environment, Society and Global Change, Faculty of Environment and Natural Resources, University of Freiburg
Dr. David Sipple
Partner and consultant, e.g. for modelling and solution-oriented sustainability approaches
Expertise: Solution-oriented Sustainability Governance, governance instruments, System Dynamics and Network Analysis, funding (state, federal and EU)
Fields of application: Food economy, business development, municipal administration and politics, municipal development
Languages: German, English
Lectures (selection):
Sipple D. (2024). Municipal scope for Fostering the Sustainable Local Food Economy. Robert Bosch Foundation, 06.03.2024.
Sipple D. (2024). A circular food economy for the city of Freiburg and the surrounding region. Circular Black Forest, City of Freiburg, Freiburg Wirtschaft Touristik und Messe GmbH & Co. KG. 22.02.2024.
Sipple, D. (2023). Municipal Tools for Fostering the Sustainable Local Food Economy. Freiburg environmental talks. Jazzhaus Freiburg, 15 November 2023.
Publications (selection):
Sipple, D.; Wiek, A. & Schanz, H. (eds.) (2024). Sustainability Governance of local food systems through municipal policy and administration. Stadtforschung aktuell. Springer VS.
Sipple, D., & Wiek, A. (2023). Municipal Tools for Fostering the Sustainable Local Food Economy. Freiburg i.Br.: Institute for Environmental Social Sciences and Geography.
Sipple, D. & Schanz, H. (2021). Leverage points of local economies. Business closures in local artisan food production from a system perspective. Spatial Research and Planning, 79(1), 58-72.
