But Hamid Reza Jafary, 48, evaded arrest, cocooned from the law by a network of five trusted Pakistani lieutenants and a low-key lifestyle that belied the fortune spun from his unique skill.
His luck ran out earlier this year when military intelligence officers traced a call by the hyper-vigilant forger to a pizza company.
Police swiftly raided an unassuming address in the Bangkok suburbs where they found The Doctor- a soubriquet drawn from his past as a nurse in Iran.
Also there, hidden in a secret compartment, were 173 passports from France, Israel, New Zealand, Iran and Syria and a cache of electronic chips, moulds for visa stamps, ribbons, inks and specialist printing equipment.
The bookish, balding Jafary quickly confessed to his crime and explained how made-to-order passports were sent via DHL or FedEX to overseas clients, including Syrian refugees trying to enter Europe.
But he refused to serve up his accomplices or reveal where the money went.
"He told me 'it's a game.... police chase the bad guys, the bad guys run. But this is game over'", Police Colonel Voravat Amornvirat one of Thailand's top immigration detectives told AFP.
Jafary was jailed in May for 23 years, but his jail time will be halved due to a guilty plea.
The Syrian migrant crisis has brought a deluge of work for Thailand's forgers.
Authorities say Jafary's gang provided bespoke travel documents for trafficking syndicates.
Over the years they had also served fugitive criminals and even wanted rebels, such as Tamil Tiger cadres escaping Sri Lanka.
But punters never met The Doctor.
"It was like a company... they had brokers and customer service people. The Doctor was at the top - but he was very low-key, he hid himself very well in the country," immigration police commander Lieutenant General Nathathorn Prousoontorn told AFP.
The colourful cabal of crooks arrested from his group were key facilitators for Bangkok's sprawling underworld.
They include a pony-tailed Pakistani craftsman called Mahammad Ramzan - known by the alias "Jonny Painter" for his sideline as a Bangkok street portrait artist.
His compatriot Abdullah Ghani Bhori, in his late 50s, was paraded in front of the media last week, alongside more than 250 fake Spanish passports and chemicals, visa stamps and laminated sheets for passports.
Officers said he had changed his identity so many times over the years that he is now only really known by the nickname "Babu".
"I learned this skill in Thailand 10 years ago," the diminutive and frail Babu told AFP, before being led away. "Now it is finished for me."
The links to Pakistan and the Middle East have caught the attention of foreign agencies fearing high end passport forgeries will fall into the hands of Islamic State terrorists.
One of Jafary's group is set for extradition to France, where a French Embassy security expert in Bangkok said he is wanted for links to unspecified "terrorist groups".
Transient, vast and permissive, Bangkok has for long provided sanctuary for people wanting to disappear or re-invent.
Thailand welcomes visa-free travel to many countries and is Southeast Asia's best connected transport hub, sharing long, ungovernable borders with Myanmar, Laos and Cambodia.
That draws transnational criminals moving everything from people and rare wildlife to drugs, weapons and gems.
In 2014, two European passports stolen in the kingdom were used by Iranians who boarded Malaysia Airlines flight MH370, which disappeared en route from Kuala Lumpur to Beijing.
Four years earlier, two Pakistanis and a Thai woman were arrested on suspicion of making false passports for Al-Qaeda linked groups, including those tied to the 2008 attacks in Mumbai and the Madrid train bombing in 2004.
Police say The Doctor's downfall has winded some criminal networks. But only temporarily whilst gaping holes remain in the detection system.
Thailand does not check passports against Interpol's stolen or lost passport database which registers tens of millions of documents.
If it was, "we would know immediately," when a stolen document was presented at a Thai border, Major General Apichart Suriboonya, head of Thai Interpol told AFP.
After the MH370 discovery Apichart recommended the country fork out the 900,000 baht ($25,000) to access the database.
"It was worth it... but we didn't do it," he added.
