,  Someone has to organize all this stuff, and we want that to be you'. And I said,  I'm sorry, there's no way we can do this. We don't have anywhere near the capacity... We can't do what you want in the time frame you want it.' And he said,  Well, who do you recommend? You know most of the people in this field.' And I don't think I was exaggerating a lot when I said,  I know everybody in this field. And no one can do what you're asking this fast.' And he says,  Well that's what we thought. So, figure out what you don't have, hire who you need,'  said Howard Cash about his conversation with the OCME.

So, Gene Codes Forensics was born. Cash and his team worked around the clock to create new DNA matching software called M-FISys: the Mass Fatality Identification System.

 We had to write code to handle the stuff that was coming in,  said Cash, describing the months they worked until they couldn't stay awake, then would sleep a few hours and start again.  They had been doing things with paper and highlighters, with printouts from the FBI's software of the day… We fired our software up for the first time with their data, and that first time we ran it, they found 55 new identifications that hadn't been made before. 

Making those victim identifications for the families waiting for answers kept Cash's team in Ann Arbor moving forward, despite the long hours and high stakes.

 Once they know, they can mourn, and once they can mourn, they can move on. And for me that's very personally rewarding,  Gene Codes engineer Jonathan Hoyle told Catallo back in 2002.

Each week, Cash flew the updated software to New York. On one of those trips, he attended the funeral of fallen firefighter Dana Hannon, whose body had not been recovered yet.

 Instead of draping a flag over a casket, four people stretched out this flag in front of three firefighters who were each holding a helmet from a firehouse that this guy had worked at. And I said at the time, 'I've got to find a way to work more hours in a day,'  said Cash.

Every time he got a new set of data, Cash would check for Hannon. Eventually, the firefighter's remains were found.

 There are people trying to find everybody, and I can tell this family - there's at least one person who's been looking specifically for them,  said Cash.

Now decades later, Cash and others still agonize over the 1,099 victims who have still not been identified.

 I've met people who never found someone who was lost at the Trade Center, and I can't help but apologize to them. I said, 'I'm so sorry, we really did everything we could,'  said Cash.

The New York Office of the Chief Medical Examiner announced in August that new genetic technology allowed them to identify one more previously unknown victim, proof that the never-ending effort to identify victims continues. The woman, whose name was withheld at the request of her family, was the 1,654th victim identified.

Back in 2002, Cash was reluctant to allow us to tell the story of the role Gene Codes was playing in the national effort. It took a lot of convincing in order for Cash to allow WXYZ to record their place in history.

 I really appreciate that you came out to kind of give us support at the time. I was worried about how the public would see it,  said Cash.  I was worried about how people would feel, that we were in some way capitalizing on something terrible. I didn't really appreciate until you left that first time, how much it meant to all my staff who were working these stunning hours that someone had come in and said, 'This really matters to the rest of us. I'm not sure I ever said thank you, but I will always appreciate that. 

Howard Cash is attending the 25th anniversary memorial service in New York. Gene Codes Forensics has gone on to help people all over the world, assisting in victim identification after mass disasters from Asia to South America, and beyond.

The work has changed him, and Cash says he feels fortunate he can play a part in bringing some peace to families who have endured these tragedies.

 Those of us who worked, especially on the recovery, something we have that is a bit of a gift is a real awareness that you never know when your number's up. That no one's promised tomorrow. And everybody knows that intellectually. But you don't think about, 'Am I wasting time here?' Until you meet thousands of people who thought they were going to have dinner with somebody, who went up the stairs, and just kept going,  said Cash.

If you have a story for Heather Catallo, please email her at hcatallo@wxyz.com