Helios Towers Africa Ltd. has announced the appointment of Kevin Koch as the new chief operating officer. Koch joins the company from Millicom International Cellular SA, where he has worked in a variety of senior roles since 2003. His roles at Millicom have included: chief executive officer of Senegal, chief operating officer of Mauritius and chief operating officer of the Democratic Republic of Congo. His most recent role at Millicom was the head of Tigo Health in Dubai, a stand-alone business unit focusing on the delivery of mobile health solutions, telemedicine, insurance products and systems integration services.