Pease has managed the £468.8m European growth fund since its launch in July 2001 and is currently top quartile in the IMA Europe ex-UK sector over three years.
He is to be joined by the rest of the New Star European team, which includes Nick Sheridan, who manages the £5m European value fund.
Pease gave a strong indicator that he would join Henderson when it was revealed recently that he had invested £0.5m into his own fund.
He says: “I am pleased to confirm I will be joining Henderson along with my European colleagues – subject to the completion of the deal – in early April. In business, confidence is very important and I am therefore delighted the deal with Henderson now provides a stable environment from which managers can operate.”