He held the position of director of administrative and financial affairs before being promoted as deputy chief of police in 1979.

[3] He served as Dubai Police chief until 23 November 2013, after which he was replaced by Lieutenant General Khamis Al Mezeina.

Tamim indicted 27 suspects who used falsified Australian and European passports from France, Germany, United Kingdom.

The suspects were linked together using falsified passports, transactions on prepaid debit cards using the same type of card, phone call records who called the same number in Austria, and camera surveillance which showed two operatives using the bathroom facility at the same hotel to wear disguises.

[10] In February 2017, he praised United States President Donald Trump's ban on individuals from seven Muslim-majority countries.

[12] In reaction to media coverage of his tweet, Tamim tweeted; “I said Qatar is faking a crisis and claims it's besieged so it could get away from the burdens of building expensive sports facilities for the World Cup”[13] After the November 2017 Sinai mosque attack by Daesh, he blamed the attack on Qatari news network Al Jazeera and suggested that Egypt should "bomb" the network in retaliation.