He replaces Dina Mufti Sid, who has been redeployed to Egypt in the same capacity.
An alumnus of the University of Nairobi, Mr Alem previously served as head of diaspora affairs at the embassy in Nairobi between 2011 and 2015.
It is during this time that he enrolled and graduated with a Masters degree from the Institute of Diplomacy and International Studies in 2015.
An elated Mr Alem told the Nation from Addis Ababa on Monday that he was grateful to the Ethiopian government for his appointment and said he will work hard to strengthen and deepen ties with Nairobi when he formally takes over.
“The relationship between the countries is exemplary in the region and my task will be to strengthen and deepen these ties further,” he said.