Following the takeover of CAP Gemini by debis Systemhaus in 1992, he undertook sales and management functions in the market sector trade until mid-1999.

Afterwards and over many years, Achim Sieren successfully established and developed Wincor Nixdorf’s SAP consulting business in the sector trade/retail as a managing director. As of 2008, he was responsible for the global setup and expansion Wincor Nixdorf’s professional services for trading companies.

In December 2013, Achim Sieren changed to GK Software AG in Schöneck, where he was the responsible chief operating officer for the areas sales, projects and services.

Since January 2016, Achim Sieren has strengthened the management board of consenso Consulting GmbH and will in particular develop and expand the positive business development based on his many years of intimate knowledge of the market sector trade.

In June 2000, Marc Weber changed to the newly founded global-e-net ISS which relaunched under consenso Consulting GmbH in 2008.

Since the beginning of his consultant career, Marc Weber has been working on numerous projects and in various roles as consultant, sub-project and project manager. He has been primarily concerned with tasks in the areas of aftersales services, logistics and master data in the environment of miscellaneous retailing projects.

Among others, Marc Weber took care of the functional overall project management for the implementation of a car trade solution (Dealer Management System) for VAPS EDV-Service Vertrieb GmbH. Subsequently, his responsibilities included the project management for the central master data management with EDEKA LUNAR GmbH and many more.

During his studies at the University of Gießen, Alexander Angerhausen could already gain first practical experience in the trade and retail sector as well as in the SAP environment – with a specific focus on the modules SD and MM. He has steadily built on this experience since he joined consenso. The starting point was his involvement in the SAP program "LUNAR" of the EDEKA Group, particularly in the areas of cut-over management and process integration.

Today, Alexander Angerhausen's main roles in consenso's projects include project management, architecture consulting and integration management. His technical focus is on process integration across the sales channel via GK software with SAP Retail and S/4 Merchandise, SAP CAR as well as SAP Forecasting & Replenishment (F&R) and C/4HANA.

A recent example of his work is the successful go-live of SAP OmniPOS by GK and SAP CAR at manufactum in summer 2018, where Alexander Angerhausen was the responsible Project Manager.

 

As a line manager, he took over responsibility for areas like purchasing, house management and organisation of leading companies. In connection with his tasks and positions, Christian Jerofke was responsible for the implementation of new ERP and analysis systems from the customer perspective.

In 2007, he started as a consultant with global-e-net ISS and has continued his career since the relaunch under consenso Consulting GmbH.

Following his successful studies in business administration with a focus on trade at the University of Cooperative Education in Karlsruhe, Holger Kainz started his professional career as a manager/purchaser for the Karstadt/Quelle group. In addition to classic tasks in sales and category management, he gathered first experiences in the context of the implementation of customised software.

Since 1998, Holger Kainz has been active in SAP consulting going through the different project roles as specialist consultant, sub-project manager and solution architect, i.a. for SAP Retail Solutions GmbH, Wincor Nixdorf Retail Consulting GmbH and axentiv AG.

Since 2016, Holger Kainz has been working for consenso as executive consultant / managing partner. As solution architect he advises trading companies in the context of digital transformation and relevant cross-channel scenarios and is responsible for their implementation also as project manager.

Following his dual studies in Industrial Engineering and a part-time MBA, Christian Liese has been working in trade and the SAP ecosystem ever since 2009.

Having held various sales roles at Wincor Nixdorf in the area of SAP/Services (both with a retail focus) and working as an Assistant to the Board, he joined GK Software AG in 2015. There he managed the daughter company AWEK GmbH as Sales Director and Managing Director and was responsible for the area of Managed Services for international retail customers in his role as VP Customer Services.

In January 2017, Christian Liese joined SAP Deutschland SE & Co. KG. He initially took on a role in Consulting Sales for the retail sector until he began working in the then relatively new Cloud division in 2018. There, he advised and supported numerous retail customers in the DACH region with regard to a Cloud move (HEC/RISE with SAP) for almost 5 years. In 2023 and 2024, he was responsible for the strategic area ‘RISE with SAP’ for several industries at SAP (Switzerland) AG.

With an extensive network and intimate knowledge of the market sectors SAP and retail, Christian Liese further strengthens consenso in the sales area.

Marcel Ruholl has been working for consenso Consulting GmbH since March 2011.

His first project already took him into the retail industry. In the SAP program "LUNAR" of the EDEKA Group, he worked as a consultant with a focus on retail processes. Further retail projects followed – as SAP Consultant, later Senior Consultant and Sub-Project Manager. Time and again, Marcel Ruholl also had the opportunity to work intensively with partner solutions, such as GK Software, and thus successively expanded consenso's expertise in this area.

Since 2015, Marcel Ruholl has been focused on omnichannel and advises consenso's customers, particularly in the area of process and platform integration. As a Solution Architect and Project Manager, he has been involved in projects e.g. at EDEKA, Jacques' Wein-Depot and JYSK (formerly Dänisches Bettenlager). Since 2018, he has also been in charge of omnichannel projects in the Middle East.

He is currently active in customer projects such as AGRAVIS and TOM TAILOR, where his focus is clearly on omnichannel and store processes. Classical topics such as SAP OmniPOS implementations are combined with digital retail services such as consenso's PriceEngine.

Consequently, since 2019 Marcel Ruholl has been responsible for consenso's Omnichannel & Store Solutions division as Managing Partner together with Alexander Angerhausen, and since 01.01.2023 he has taken on this task alone.

When it comes to sports, Marcel has successfully dedicated himself to triathlon. Accordingly, we are always happy to welcome him at consenso events such as the TriCamp or as a participant in company runs!

At that time, Waldemar Krause had already gained several years of experience in a large trading company for fastening elements, where he started working after graduating with a bachelor's degree. There, in addition to sales activities, he supported the development of a new division for the modern supply of customers with customised parts.

Waldemar Krause has been able to apply and deepen his SAP knowledge in many challenging projects as Senior Consultant, Sub-Project Manager or Project Manager with various customers from the retail sector.

Today, apart from the integration of omnichannel processes into SAP S/4HANA, SAP CAR or SAP F&R, the focus of his work is on various procurement-to-pay processes. Here, his technical focus is on forecast-based planning and scheduling (disposition).