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Lieutenant Colonel (U) Pengiran Haji Mohammed Hasreen bin Pengiran Haji Ali Hassan (preferred to be known as Pengiran Hasreen) was born on 26th July 1974. He started his military career when he enlisted into the RBAF on 3rd January 1994 and commissioned from the Royal Air Force College, Cranwell, United Kingdom on 9th February 1995. Upon commissioning, he was awarded the 'Sarah Moland Memorial Prize for Outstanding Courage and Fortitude'. He holds a Post Graduate Diploma (PGDA) in Defence and Strategic Studies from Massey University, New Zealand (2011) and also a Masters of Science (M.Sc) in Defence Management from the Indonesian Defence University (2014).

Lieutenant Colonel Pengiran Hasreen is an Air Force Supply/Logistics Officer by vocation where he has attended various logistics courses in the United Kingdom (Supply Officer Training in 1997 and Intermediate Logistics Management Course in 2004) and Singapore (Army Advanced Logistics in 2010). Apart from logistics courses, Lieutenant Colonel Pengiran Hasreen has attended other courses such as Aviation Medicine (1995), Basic Manpower (1999) both in Singapore and the Junior Staff Course, New Zealand in 2002 where he was awarded the Best Foreign Student Award for that course. Lieutenant Colonel Pengiran Hasreen has held logistics post such as the Air Force Quartermaster (1996-1997), Flight Commander Technical Supply (2001-2005) and Officer Commanding Supply Squadron (2009-2012). However, throughout his career he has had the opportunity of holding several posts outside the logistics domain such as Staff Officer Grade 3 Personnel and Admin, RB Air Force Headquarters (1998-2000), Aide-de-Camp to His Royal Highness the Crown Prince, Senior Minister at the Prime Minister's Office and General of the RBAF (2006-2009), Officer Commanding Administration Wing, RB Air Force HQ (2012-2014), Senior Directing Staff at the RBAF Command and Staff College (2014-2016) and currently as the RBAF Defence Academy Chief Instructor. Lieutenant Colonel Pengiran Hasreen had the privilege of attending the inaugural Royal Brunei Armed Forces Command and Staff Course in 2010-2011 and subsequently was selected to pursue his Masters at the Indonesian Defence University from 2012 to 2013. He has been bestowed the Darjah Setia Negara Brunei Yang Amat Bahagia Fourth Class (PSB) in 2011.

Lieutenant Colonel Pengiran Hasreen is happily married to Pengiran Hartini, a Clinical Psychologist and is blessed with 3 sons (Izz Khan, Zaydaan and Na'el) and a daughter (Nadyne). He is an ardent sportsman that includes football, cycling, mid to long distance running and occasionally triathlon. He has been trying to pick up golf but has been unsuccessful for a number of times.