Clinical research and development group Venn Life Sciences Holdings has confirmed Jonathan Hartshorn has begun his tenure as the group's new chief financial officer.The London-listed company had appointed Hartshorn, who left his role as head of finance for the onshore division of Mainstream Renewable Power, on 12 May."It is important that we maintain a strong focus on the business's financial management and I am confident that Jonathan will be a great asset to the business in this regard," group chief executive Tony Richardson said at the time of the appointment.Venn shares were down 2.05% to 21.55p at 10:33 on Monday.