Siers & Collegen GmbH


The common project with Siers & Collegen enabled us to considerably further develop the cross-sectoral market cultivation of Sales, Solutions, Operations and Service. Therefore, our customers are generating clear additional benefits. At this, the linked approach of structure & corporate culture of Siers & Collegen helped us accomplish a real change in the team.

Roland Jeutter
Managing Director AVL Deutschland GmbH

The long-standing co-operation with the sales consultant Siers & Collegen has always been very partner-like and goal-oriented. Especially outstanding with the team of Siers & Collegen is the high implementation competence, whether it be by means of the conception of pragmatic sales guide rails, the qualification of managers & staff or the development of the corporate culture. At large, this has helped us deal with our markets more efficiently nowadays.

Frank Koch, Chairman of the Board

We have been co-operating with Siers & Collegen for several years. The clear focus on implementation of Siers & Collegen helped us implement our sales concepts on the market optimally. In addition, it was decisive that the managers were developed into implementation multipliers and, thus, promote the change process optimally.

Martin Metzler, Head of Sales Bath & Wellness EMEA (Europe, Middle East, Africa)
Villeroy & Boch

The sales project with Siers & Collegen has lead to measurably improved results in sales. On the one hand, the systematic linking of structural and cultural aspects represented significant factors of success. Furthermore, the stringent implementation support ensures that power is really turned into motion.

Ralf Hoffmeister, Head of Sales
BIOTRONIK Vertriebs GmbH & Co. KG

Siers & Collegen are accompanying the department of Simulation & Training of Rheinmetall Defence Electronics during the introduction and implementation of international key account management. Civil and military markets require different approaches in sales worldwide. In addition, the sales of our highly technological and consulting-intensive products with occasionally very long decision periods require a partner by its side who pursues a structured and practice-relevant consulting approach. In Siers & Collegen, we have found this partner, who additionally accompanies the important implementation phase closely and professionally so as to achieve a sustainable change in practice.

Thorsten Heinzen, Head of Sales Rheinmetall Defence
Electronics GmbH

The long-standing and partner-like co-operation with Mr. Siers and his team of consultants has significantly contributed to the improvement of our market position. Here, the linking of structural and cultural elements is to be especially highlighted. Thus, our market strategies are professionally and consistently implemented.

Christian Arras, Managing Director
NSM-Löwen Entertainment GmbH

The co-operation with Siers & Collegen contributed to the fact that we were able to increase the occupancy situation in our almost 100 geriatric care facilities. Secret of success: Due to the early integration of the staff, the change process was professionally initiated and continuously accompanied. Especially, the interdisciplinary exchange over various sectors has professionalized our sales activities.

Diana Hawranek, Head of Marketing& Strategic Sales
Kursana/Dussmann Group

It is difficult to find a partner who has analytical, conceptional and implementational competence. We have found this partner in Siers & Collegen. Thus, our sales strategies are consistently and sustainably implemented on the market.

Patrick Heinen, Managing Director
Kinnarps Deutschland GmbH

We initiated a sales project with Siers & Collegen for the development of new target groups. Result: Sustainable improvement of the sales quality and results by means of a tailor-made sales concept – implementation by means of qualification and coaching on the job at eye-level at any time.

Markus Derix, Managing Director
Derix GmbH

The joint project with Siers & Collegen helped us considerably, not only to obtain a clear picture of the status quo of our corporate culture but also to create clear common (also cross-sectoral) goals and a resulting interaction on this basis which characterizes and simplifies the common daily co-operation. The transparent and, above all, pragmatic approach is of practical benefit for us so as to achieve change and advance it in a focused way.

Thomas Schmidt, Chairman of the Board
ENTEGA Energie GmbH

The sales project that we carried out together with Siers & Collegen helped us significantly with our transformation process within a few months. With joint forces, a product and technology-oriented company was turned into a dynamic / customer-oriented organisation that meets the continuously changing market requirements.

Daniela Strasser, Head of Sales
Next ID GmbH / Freenet Group