Iwasaki was born and raised in Iwate Prefecture and attended Morioka Third High School.
He attended the National Defense Academy of Japan, graduating into the Japan Air Self-Defense Force in 1975.
He is trained to fly the McDonnell Douglas F-15 Eagle, Japan's primary jet fighter.

In August 1991, then-Lieutenant Colonel Iwasaki took command of the 201st Tactical Fighter Squadron.
In December 1997, then-Colonel Iwasaki took command of the 7th Air Wing.
In January 2001, then-Major General Iwasaki took command of the 2nd Air Wing.

In December 2010, General Iwasaki became the 31st Chief of Staff of the Japan Air Self-Defense Force.
As Chief of Staff, he spearheaded the effort to procure the fifth generation Lockheed Martin F-35 Lightning II.

In January 2012, General Iwasaki was promoted to be Chief of Staff of the Joint Staff, becoming the highest-ranking official in the Japan Self-Defense Forces.
He replaced GSDF General Ryuichi Ariki, and his Vice Chief of Staff was Kōichi Isobe.
He has presided over a number of significant national security issues, including the renewed Senkaku Islands dispute and the possible revision of Article 9 of the Japanese Constitution (following the Liberal Democratic Party's landslide electoral victory in December 2012).

In 2015 he was appointed an honorary Officer in the Military Division of the Order of Australia, for his role in enhancing defence engagement and practical co-operation between Australia and Japan.
Iwasaki was born and raised in Iwate Prefecture and attended Morioka Third High School. He attended the National Defense Academy of Japan, graduating into the Japan Air Self-Defense Force in 1975. He is trained to fly the McDonnell Douglas F-15 Eagle, Japan's primary jet fighter.
In August 1991, then-Lieutenant Colonel Iwasaki took command of the 201st Tactical Fighter Squadron. In December 1997, then-Colonel Iwasaki took command of the 7th Air Wing. In January 2001, then-Major General Iwasaki took command of the 2nd Air Wing.
In December 2010, General Iwasaki became the 31st Chief of Staff of the Japan Air Self-Defense Force. As Chief of Staff, he spearheaded the effort to procure the fifth generation Lockheed Martin F-35 Lightning II.
In January 2012, General Iwasaki was promoted to be Chief of Staff of the Joint Staff, becoming the highest-ranking official in the Japan Self-Defense Forces. He replaced GSDF General Ryuichi Ariki, and his Vice Chief of Staff was Kōichi Isobe. He has presided over a number of significant national security issues, including the renewed Senkaku Islands dispute and the possible revision of Article 9 of the Japanese Constitution (following the Liberal Democratic Party's landslide electoral victory in December 2012).
In 2015 he was appointed an honorary Officer in the Military Division of the Order of Australia, for his role in enhancing defence engagement and practical co-operation between Australia and Japan.
Shigeru Iwasaki