Following the acquisition, Deloitte has launched a new leadership consulting practice and plans to recruit 700 people across network of member firms by 2020; 140 of which will be in the UK.

Kaisen currently employs 60 staff, including 30 occupational psychologists, based in the UK and US. It has 25 years' experience working with senior leaders in more than 40 countries.

The new practice will initially be launched in the UK, US, Canada, Australia, and Japan, before it is rolled out to Deloitte's network of member firms.

Kaisen was advised by Bishop Fleming and Burges Salmon.

Richard Houston, managing partner of consulting at Deloitte UK, said: "Having initially established an alliance with Kaisen almost five years ago, today's transaction is the next phase in integrating the specialist knowledge and experience of the two organisations.

"The establishment of Deloitte's leadership practice is an important step in building our global consulting business, allowing us to help clients identify, develop and retain their leaders."