Day One

Before creating Day One in 2003, Olivier worked at Arthur Andersen as a Director of Marketing and Development, and he developed the marketing and business development function at Ernst & Young (EY).

Olivier wanted to create a niche consulting firm on a human scale with high added value and with a solid international team to work with the General Counsels of large companies or partners from law firms.

The client culture at Day One is strong and every member of the team, from Junior Analysts to Partners, must be in direct contact with the client.

Sport values prevail at Day One, whether in the strong team culture or in the common group planning between Paris and Casablanca teams.

Teams seminars are held twice a year in order to share best practices and to have a good time together.

Olivier is a Lecturer at Sciences Po Law School on “Legal Project Management” and at the executive Master for General Counsels. He is a PhD Candidate at University of Panthéon-Assas (Paris II) in economic sciences. His thesis and academic work deal with “legal and compliance as a competitive advantage”.

Jiaying graduated from Paris II Panthéon-Assas University in Corporate Strategy and Organizational Economics. Attracted by the varied and stimulating subjects and the friendly atmosphere of the firm, she joined Day One as an Analyst after completing her internship there at the end of her studies.

She helps clients when delivering solutions to strategic and organizational challenges with the whole team. She is also strongly involved in internal missions, such as redesigning the new graphic charter or improving the training system to facilitate the transmission of knowledge.

She particularly appreciates the sharing culture and the team spirit at Day One!

Cerise worked at the Legal Department of a Media Group up for 7 years before joining Day One team in 2017 as a Manager.

Cerise enthusiastically helps her clients - mainly Legal Departments - to transform and to meet their strategic and organizational objectives. She helps them to structure and realize their actions plans. With the whole team, she also finds the most adapted and innovative solutions to face their challenges!

As a Manager, Cerise leads and manages teams around a mission. She is also responsible for the development issues and is involved in the firm's strategic orientations. She oversees the planning of all the firm's missions.

Follow them!


Day One is a management consulting firm dedicated to Legal and Compliance.

Founded in 2003, Day One has been helping professional services firms (auditors, lawyers, consultants, chartered accountants, notaries…) and corporate departments (Compliance, Legal, Tax, Internal Audit…) with their strategic challenges, positioning, organization and development.

From its offices in Paris and Casablanca, Day One team has been working with more than 130 legal departments worldwide (including 17 from the CAC 40), and with more than 150 law, consulting or audit firm in over 30 countries!

What they are looking for

Day One is looking for committed and curious people who are convinced that there are great things to be done to define tomorrow’s organizations and ways of working.

If you wish to actively participate in a business project, in an international, dynamic, innovation-oriented environment, your profile may be selected!

Good to know

Everyone at Day One plays a role in our pro bono program “Day One + One”.

Day One team spend time and efforts providing free management consultancy services to the charity or the not-for-profit organization chosen by the team.

Everyone is encouraged to take time off work to lead this project if they they want to.

Day One’s values: loyalty, search for excellence, pragmatism, team spirit, passion.

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