Riedel Communications names European Media Group’s Lucy O’Brien director-customer success, Europe, the Middle East and Africa ... Spectrotel, communication services provider, names Observe.ai’s Robert Fish, also ex-Intelisys, vice president-south region channel sales ... Truecaller, global communications platform, names MetaMap’s Ogochukwu Onwuzurike country manager-Nigeria, and Uber’s Nicolas Vargas country manager-Colombia ... Video compression company Reticulate Micro adds former American Battery Metals CEO Doug Cole and Ian Subel, Fogel Capital Partners managing director, to its board ... PacketFabric, network-as-a-service company, announces Vincent English, ex-Megaport, as CEO … Sigmoid, data engineering and AI consulting firm, taps Shankar Viswanathan, ex-Procter & Gamble, as chief commercial officer.