Atom Wave

We improve organisational performance by supporting organisations to become even more human focused.

  • Founded in 2002 in Athens, Atom Wave (then H2gO) has pioneered coaching and mentoring in Greece. Operating both in Greece and Switzerland, it is offering ICF Accredited training to corporate coaches, tailor-made coaching skills programs for managers, Formal mentoring programs and executive coaching.
  • We are a network of credentialed coaches, facilitators, and instructional designers committed to improving organisational performance by supporting organisations to become even more human focused. We share common ways of working, ethics and the belief that people at all organizational levels can significantly enhance their leadership effectiveness through addressing their people at their strengths, through developing relationships of trust, and through building a coaching culture. 
  • Our clients include some of the leading corporations in the world, and so far we have  successfully designed large-scale structured Coaching and Mentoring programs for 100+ organisations internationally.
  • We have invested in the development of our own model for tracking and translating business impact and ROI of our Coaching programs because we believe that helping leaders understand the business impact of coaching helps sustain a coaching mindset towards people development and this reinforces program efficiency and ROI.
  • Our "Solution Focused Coaching Skills" program was shortlisted for the 2014 European and Mentoring Coaching Council (EMCC) Best program award.
  • The Mentoring@SchneiderElectric won the 2022 HR Silver Award.
  • Our “Internal Coach Certification” is  the first Solution Focused ICF accredited ACSTH program exclusively designed for INTERNAL COACHING.

Who we Are

Olympia Mitsopoulou, PCC

Olympia has 30 years’ experience working as a coach, mentor, trainer and instructional designer. In 2002 she founded Atom Wave (then H2g0) because she believes that addressing people at their strengths as well as developing relationships of trust are the key to High Performance Organizations. Along with her Atom Wave associates, she has designed large-scale structured Coaching and Mentoring programs for 100+ organisations internationally.

Olympia is an expert in supporting organizations create their own teams of internal coaches and mentors. She is one of the pioneers in designing structured programs of mentoring since 2002. In 2018, she designed the “Internal Coach Certification” the first Solution Focused ICF accredited ACSTH program exclusively designed for Internal Coaching and a vision of the ‘democratization’ of coaching through giving access to high-quality coaching services to large numbers of employees.

Olympia has developed the Zoom-In Zoom OutTM model for tracking business impact and ROI of Leadership Coaching programs to help leaders understand how developing a coaching mindset is linked to business results. The Atom Wave "Solution Focused Coaching for Managers" was shortlisted as Best European program in Coaching by the European Mentoring and Coaching Council (EMCC).

She holds the ICF Professional Certified Coach credential, Certified Mentor Coach, Solutions Academy Certified Master Coach, with a strong background in adult education, facilitation and psychometrics. She holds a B.A from the American College of Greece in Psychology, and an M.Sc. in Occupational Psychology from the University of Cardiff.


Marialexia Margariti is an organizational psychologist (M.Sc.) & Certified Psychotherapist (M.A., ECP), Professional Certified Coach by the ICF (PCC), EMCC Assessor of training providers (EQA) & coaches seeking individual accreditation (EIA) and supervisor.

She spent a large part of her career in the corporate world, starting in the area of Human Resources, and later in the areas of brand management and advertising at European and global levels.

She has coached senior managers, individually & in teams, for more than 1.500 hours and has worked as senior trainer in large coaching & mentoring programs at local and international levels.

In the last couple of years she is supervising teams of students in coaching training programs (internal & external coaches).

Marialexia is currently Vice President Quality in EMCC's International Executive Board responsible for matters related to Ethics, Regulation, Diversity & Inclusion, competencies & CPD for coaching/mentoring/supervision. She is a founding member and former President of EMCC Greece. She is also member of European Association of Psychotherapy (EAP), National Organisation of Psychotherapy Greece (NOPG) and International Coach Federation (ICF).


Katy brings to coaching Balance and Maturity. The combination of her 30+ yrs of experience in People Development combined with her entrepreneurial background (also owner of a successful advertising-graphic design agency), offers clients practicality combined with Emotional Intelligence.

Katy has participated in large leadership development and coaching programs for Alpha Bank, Nestle, Eurobank Cards, Papastratos Philip Morris Int'l , AIG, Piraeus Bank, National Bank of Greece, Makro Cash & Carry, Johnson & Johnson, Astrazeneca, Hellenic Petroleum, Hellenic Aerospace Industry.

As an executive coach, she has more than 800 logged coaching hours (Alpha Bank, JTI Hellas, AXA, LeasePlan Hellas, Alcon, Nestle, CSL Behring, Astrazeneca, FHP-Vileda, Randstad Hellas, Persado, Greenpeace, Iberdrola, etc) within which she has coached more that 250 senior managers. She has worked as Senior Project Manager for Thomas International (Personal Profile Analysis) - SELECON CONSULTANTS, working on applications of Thomas system, consulting & training. She has also worked as Project Manager for Grid Seminars of Scientific Methods - INTERSYSTEMS MANAGEMENT CONSULTANTS, working on Marketing, client development & implementation of Grid management programs and as Senior Management Trainer for ACHIEVE GLOBAL - Professional Selling Skills (PSS)

She is a founding member of the Hellenic Coaching Association (Affiliate of EMCC) and ICF Greece Chapter Katy speaks Greek, English and Turkish.

She is Associate Certified Coach - ACC (ICF - International Coach Federation), trained Professional Coach (Core Essentials Coaching Skills Program - Coach U, UK), Diploma in Brief Coaching (Solution Surfers), Certificate in Solution Focused Team Coaching (Solutions Surfers), ICF competency Brush-Up Program (Positive Life Works), Certified Thomas System Analyst (Thomas International - PPA System), International SystemicTeam Coaching (Academy of Executive Coaching).

Christiane KOSUB, PCC

Christiane is a Professional Certified Coach by ICF (PCC), Mentor-Coach ICF, Group Dynamics Trainer (DGGO) and EFQM (European Foundation for Quality Management)-Assessor.

 She brings more than 25 years of experience in management development for profit organizations in the pharmaceutical, automotive, telecommunications and insurance industry amongst others.

As Personal Development Manager and Department Head of Quality Management in an insurance company and Manager of Seminars in a software company, Christiane has gained internal experience of different organisational cultures and roles. Her intercultural competence widened while she lived and worked in China at Renmin University Beijing as visiting professor. 

Her focus is change management, leadership, team and individual development in an international, fast-moving environment. She is a communications expert.

For the last couple of years her main focus has been on solution focused coaching with senior managers, career coaching, mentor coaching, intercultural training and working as a supervisor in the CAS (Certificate of Advanced Studies) “Leadership in Health Care”. 

Her aim is to support people discovering and using their resources to achieve their best hopes by strengthening their self confidence.

She is fascinated by working in partnership with her clients, sharing insights, bringing humor and encouraging flexibility.

Since more than 10 years she is living in Switzerland close to Basel.




If it's possible to be a case study for your own business, then Kostis Tsounakis is the perfect example.

After a successful 15-year career in sales and operational management, Kostis decided to reinvent himself. He did an MA in Business Development then trained in systemic consultation and leadership under Peter Lang. Caring, calm, and a natural connector of dots, Kostis realised that coaching was his calling.

In 2011, he joined iDealogy, a boutique consultancy for collaborative leadership and creativity based in Athens, as a team coach and organizational development consultant. In 2014, Kostis moved to London and founded AHUM Coaching for Transition.

Since 2001, Kostis has coached over 25 global organisations and brands, including banks, NGOs, retailers, telecoms, pharmaceutical, oil companies, advertisement companies and digital media agencies delivering more than 300h of team coaching in organisational development projects and more than 1200h of Coaching to senior executives (McCann Worldgroup, Roche, Prudential, Takeda, BP, Deloitte, Credit Swiss, Societe Generale, Eurobank, Adweb, Action Aid, Greenpeace, WWF, Goody's, Resoul, EMA).

Combining hands-on business experience with a deep grounding in systemic thinking, Kostis has a knack for seeing the bigger picture - and bringing out the best in everyone. Kostis is Certified and Accredited Coach by EMCC

ROI of Coaching - ATOM WAVE Client Case

Read how a major Greek bank measured the ROI of Leadership Coaching based on the Atom Wave Zoom IN - Zoom OUT model.

Business Partnerships:

A marketing communications and people change management expert Alan Kay, blends years of applied industry experience and best practices delivery of practical tools on leading people to solve problems and be creative about making solutions happen.

Currently, Alan is the principal of a change management consulting business, the Glasgow Group serving a diverse group of clients in Canada, the US and Europe.

KarmaGenes, meet yourself.

We are business partners with Karmagenes, a Swiss biotech, which has come up with an innovative way of determining the contribution of genetics and the environment to your personality traits. Using a sample of your saliva, their advanced molecular analysis methodologies identify the link between genetics and 14 behavioral characteristics like innovation, spontaneity, strategy, risk taking, decision making, confidence, stress tolerance, calmness, optimism and self awareness.

We use Karmagenes analysis for our executive coaching assignments to support our clients discover their strengths and formulate their own exciting future.