Professional sparring partner

Only with experts and professional partners is it possible to understand the specific areas of digitalization and realize how meaningful they can be for companies. 123C offers years of experience in the optimization of digital areas. We work exclusively with partners who are a good fit for us and at the same time are absolute professionals in the fields of digital transformation.

Direct & sustainable

123C sees the comprehensive specialist consulting of companies and the development of individual strategies as a central package of measures on the way to digital core competencies. Together with our customers, we define the required digitalization processes and support the company internally and externally in regards to implementation and sustainable optimization. In this way, we do what we do best as digital experts:

To accompany the company and its customers on the path to digital excellence. 
Hintergrundbild Sparring Grüne Quadrate

We are 123C Digital Consulting

Harald Grabner Geschäftsführer 123Consulting

Harald Grabner

Harald Grabner is founder and owner of the digital consulting agency 123Consulting, which is also partner of 123C Digital Consulting GmbH. After completing his education at WU-Vienna with a Masters of Advanced Studies for Executive Management, he started his professional career as Head of Marketing in international corporations. Coming from an entrepreneurial family, Harald Grabner knows the digital challenges of medium sized companies. His distinctive competence and a high degree of understanding for the “needs” of companies are attributes the characterize his professional work.

Thomas Apollonio Digital Senior Account & Business Development

Thomas Apollonio

Thomas Apollonio is one of the Managing Directors of 123C Digital Consulting GmbH and Business Partner of 123Consulting. A marketing and digital business expert, he graduated from the University of Advanced Sciences of Journalism & Media Management. Studying integrated Communications abroad at the Hogeschool van Utrecht led Thomas Apollonio on the path of digitalization. With more than 10 years of international consulting and a strong sense for the “digital space”, he likes to support companies in excelling their digital maturity. His knowledge of digital transformation combined with digital maturity sets him apart.

Renggli Neu

Daniel Renggli

Daniel Renggli is an experienced management consultant with a clear focus on the entire digital experience of companies. After starting his career as a systems engineer at IBM, Daniel spent around 25 years in senior marketing and sales positions at global players such as Microsoft, Oracle & SAP. With a passion for artificial intelligence and automation in marketing, sales and service, he advises medium-sized companies in Switzerland together with 123C Digital Consulting. Daniel Renggli supports the strategic and conceptual level and offers digital transformation at the top level.

Daniel Mittheis

Daniel Mittheis is an experienced project and process manager with a Master of Science in Management. He specializes in sustainable corporate management and digital transformation. At 123C Digital Consulting, Daniel brings his extensive knowledge to accompany companies on their path to digital maturity. Daniel has previously developed his skills in various positions. Among other things, as a project manager and sustainability strategy consultant at Accenture and as a technical IT project manager at bestbytes. He also gained valuable experience and took on project management roles in various start-ups during his studies. His expertise in end-to-end project management, process management and strategy consulting qualify him as a competent partner on the path to targeted digital transformation for the companies that we provide comprehensive support to at 123C Digital Consulting.

Eva Sommerer

As Digital Business Development Manager at 123C Digital Consulting, Eva is responsible for sales and marketing. Thanks to her experience in digital business and sales development, she is the technical contact for online strategies and customer acquisition. Currently Eva is doing her masters degree at the university of Vienna. With her motivation and commitment, Eva helps to strengthen the market position through digital marketing solutions and effective sales strategies. In this way, she optimally prepares companies for the challenges of digital transformation.

Our Experts

Foto Jörg Egretzberger
Data Science & Development

Jörg Egretzberger

Jörg Egretzberger is the owner of Trustbit GmbH. His Company offers methodical data development according to the needs of companies. As a strategic data expert, he has more than 15 years of industry experience with top international companies.

Anyone working with customers in the field of technical development today meets the current challenges with a holistic approach. This encompasses the core business and revolves around the central corporate processes in the area of data procurement and subsequent processing. Anyone who thinks in terms of data science must be prepared in advance to be able to create the required data spectrum. Jörg Egretzberger knows the world of data like the back of his hand and moves within the departments in an agile and iterative manner depending on the company’s needs.

Kerstin Wagner Marketing & CRM Expertin
Marketing Automation & CRM Expert

Kerstin Wagner

With 15 years of management experience in CRM, Marketing Automation, Digital Strategy implementation and the broad spectrum around Customer Excellence, she brings both technical and process expertise to these topics.

Kerstin Wagner has an international professional education (MBA) and many years of experience in customer excellence and the implementation of digital measures to develop customers along their digital transformation. Her consulting company advises diverse verticals but has as strong focus on the healthcare industry and e-commerce. Her core areas of expertise include data-driven marketing automation and the implementation of comprehensive CRM strategies for companies. Thanks to her excellent conceptual work and the sustainable implementation of digital projects, Kerstin Wagner manages to create a perfect support package for companies of all sizes.

Markus Plank Digital Media & Strategy Experte
Expert Digital Media & Strategy

Markus Plank

As President of IAB and Managing Director of numerous advertiser companies, Markus Plank not only brings years of industry expertise, he is one of the leading minds in digital marketing strategies in line with data platforms.

Markus Plank provides comprehensive expertise in the field of technical and programmatic campaign conception for the digital marketing mix of medium sized companies. As a leading industry expert, he is a top consultant in the field of strategic media marketing. Furthermore, as the Austrian President of IAB he enjoys dedicating his time to data ownership and the much sought after “cookieless future”. Markus Plank has a broad field of knowledge when it comes to equipping companies with high performance campaign systems and developing them further based on on marketing needs.

Ronny Hollenstein Communication Experte
Communication Expert

Ronny Hollenstein

As founder an owner of GRUPPE HOLLENSTEIN, Ronny Hollenstein has been dealing with behavior and the hidden resources in people for more than 25 years. As a top professional, he has a comprehensive impact in the field of communication. With his coaching activities he supports in workshops and lectures those people who have to deal with challenging situations.

Ronny Hollenstein has gained years of front row experience and has dedicated himself to the strategic development of communication concepts. In negotiations and media present discussions with top managers, ministers and lobbyists, he was able acquire a comprehensive practical skillset of communication techniques. Ronny Hollenstein has coached many personalities and developed them in their individual needs. Analog as well as digital.

Univ.-Prof. Dr. Siegfried Meryn
Future Health Visionary

Univ.-Prof. Dr. Siegfried Meryn

Siegfried Meryn is considered one of the most important health experts in the German speaking world and is ranked among the top 10 in Austria´s network of "Future Shapes". He has been chairman of the ORF (=Austrian Broadcasting Corporation). Health Advisory Board for 15 years and, with his expertise, broadcasts weekly TV and radio formats for a broad audience.

Siegfried Meryn is an impressive personality and at the same time a driving force in innovative, medical preventive care. He understands this in a close, technological connection. With a strong international background, he helps those who are needy and socially marginalized. Siegfried Meryn sees the right to a healthy and long life as a basic element for human beings. As a specialist in internal medicine, co-founder of CAPE 10 and the Future Health, Siegfried Meryn offers extensive knowledge in the visionary elaboration of complex ecosystems. He is a top speaker at international congresses and is appreciated worldwide for his vision and expertise.

Gerald Schneider Digital & Hybrid Eventising
Strategy Consulting Trade Fairs & Customer Events

Gerald Schneider

Gerry Schneider offers more than 15 years of event & congress management knowledge and industry experience. As Vice President Events at WeAreDevelopers, he ist the expert in the field of digital events, hybrid events as well as in the overall organization of classic, physical events.

Gerry Schneider is a top manager in the event industry and has a large network of international contacts in the MICE scene (Meetings, Incentives, Conventions, Events). As the organizer of one of the largest software developer events in Europe, he is familiar with the most important digital tools and constantly re-evaluates the current needs of the industry. In his role, Gerry Schneider is one of the best expert consultants when it comes to online, hybrid and presence events.

Mag. Dr. Alexandra Singer
Organisational and Personnel Development

Mag. PhD Alexandra Singer-Weidinger

Mag. PhD Alexandra Singer-Weidinger is Managing Partner at Jobaffairs GmbH, communication scientist and management consultant with a focus on the customized optimization of systematic organizational development processes in the HR sector of profit-oriented companies and organizations within a public mandate.

As a coach, she accompanies people and projects with a vision, analyses and structures workflows and bring dynamism into unproductive processes. Employer branding, candidate journey, onboarding, employee experience are the magic words of modern organisational culture. Mapping authenticity on the web and developing team matches are two of the most important goals to ensure own products and services on a high innovative as well as consistent quality level. Clearly: Success is motivation! Together we demonstrate the possibilities where perspectives can grow. In analogue as we well as digital form. Customised and with guaranteed success.

Digital Expert & Visionar

Thomas Catulli

As CEO of SPS Marketing and a visionary, Thomas Catulli brings not only years of history in the digital business but also ranks among the absolute authorities in digital marketing. With a lengthy track record in digital transformation of companies, Thomas Catulli as CEO of SPS Marketing, oversees international B2B clients.

Thomas Catulli possesses a strong digital skillset and embed operationalization deeply within companies, Judging from his expert knowledge, every business must be equipped for the digital realm. The visionary views AI is the greatest development and societal challenge since the industrial revolution. Thomas Catulli has been a digital marketer for 25 years, born to be digital. His passion defines his persona and strategic understanding to engage individuals at digital levels.

Andreas Berth - Experte
Industry Expert in Digitalization in Retail

Andreas Berth

Andreas Berth possesses extensive expertise in the field of digitalization and is a specialist in online marketing. As a long-time managing director, he has not only gained insight into various projects and challenges but also understands both the business and implementation aspects of the industry.

After completing his studies in business administration and business informatics, Andreas Berth began his career as a Director of Sales at a globally leading multimedia agency. Subsequently, he spent several years as a Senior Consultant at the management consulting firm Accenture before co-founding the internationally active digital agency, B2 Performance, together with Lars Biewald. The agency had offices in Germany, Austria, Switzerland and Spain.
Since 2020. B2 Performance has become a part of the Zander Group (wholesailer for HVAC and electrical), which also holds the majority of the company.