Emmins praised Irving's "enormous" efforts in setting up the agency, and said he is fully behind his decision.
"After a lot of soul searching Ian Irving decided a couple of months ago to step away from the Tailor of Shoreditch due to a family illness. Family obviously comes first – and we obviously support Ian on this. We all feel for Ian. 'Irv' had an amazing first 18 months driving the business forward with an amazing array of clients and body of work– but understandably any start up business takes up an enormous amount of time and energy."
Irving is no longer a shareholder at the company, which is run by Laura Derbyshire, who was appointed as client services director in December last year, but has been promoted to managing director.
Emmins added: "With his current situation Ian did not feel that he could give the agency the focus that it needs at present and hence the amicable return of equity to (Amplify and Tailor parent company) Louder. We've still got a lot of time for Ian and the door has been left firmly open if and when his personal circumstances change."
The Tailor of Shoreditch boasts clients including Ben Sherman, Wagamama, Avid and Benefit. It reported a 29% profit boost last year.
Jonathan Emmins: "The door is still open."