Romanian engineer Dumitru Comanescu, a Bucharest resident who is 111 years and 7 months old, has become the oldest living man in the world after British Bob Weighton died on May 28 at the age of 112. He used to work as an agricultural engineer and phytopathologist and was a disciple of Gheorghe Ionescu Siseşti, the founder of the Agriculture Research Institute. He initially studied at the Mathematics Faculty and had among his teachers well-known Romanian mathematician Gheorghe Ţiţeica. He later found his calling in working in agriculture. He graduated from university in 1933 and worked for 70 years. In 2003 he performed his last phytopathology assessment. When he was 86 years old, he took part in a competition for agriculture experts, where he finished fifth.