Marlon had initially joined Luton Town in late October 2003 on a short-term contract at the age of 34 as manager Mike Newell sought to put an experienced goalkeeper between the sticks, having played 19-year-old Robert Beckwith and 17-year-old Dean Brill for the first three months of the 2003-04 season.

With the Hatters in administrative receivership, Newell was told by the Football League that he couldn’t sign any new players unless he allowed either Courtney Pitt, on loan from Portsmouth, or Gary McSheffrey, on loan from Coventry City, to return to their club. With McSheffrey in fine goal scoring form, Newell made the difficult decision to allow Pitt to return to Fratton Park so that he could sign an experienced goalkeeper – a decision he felt was vital after the Hatters had lost 2-4 at Brentford and 3-6 at AFC Bournemouth in their previous two matches.

On signing for Luton Town, Marlon boasted an impressive record of having saved 50% of all penalties taken against him and he had made 344 League appearances in a long and distinguished career. He had been without a club briefly before arriving at Kenilworth Road following his departure from First Division Bradford City, where he had been on a short-term contract.

He began his career with Sheffield Wednesday, having progressed through the youth set-up at Hillsborough. However, he failed to make a single appearance during his time with The Owls – although he would later return to the club and make his debut for his first club. Whilst at Hillsborough, he enjoyed loan spells at Bury in 1989, where he made just one appearance, and then at Northampton Town (13 League appearances) in 1990, Crewe Alexandra (3 League appearances) in 1991 and then once more at Northampton Town (15 League appearances) in 1991.

In August 1992 he was sold to Burnley for £95,000 where he would go on to become a huge success and earn himself a reputation as a real fans’ favourite at Turf Moor. He spent six years with The Clarets, making 294 appearances in all competitions (240 in the League) and also continued his fine penalty-saving record when stopping a Bontcho Guentchev spot-kick against the Hatters at Kenilworth Road during the 1995-96 season.

In March 1998, Marlon left Burnley and joined Middlesborough, with whom he would go onto play in the Premiership for. He spent four years at the Riverside Stadium, making his debut on March 11th 1998 in a 6-0 First Division home win over Swindon Town. He also featured in a 0-0 draw at Portsmouth and a 3-0 home win over Norwich City during that season, the 1997-98 campaign.

Having helped Middlesborough to promotion to the Premiership, Marlon appeared 7 times during the 1998-99 season, 4 of those appearances coming in the top Division of the English League in a 2-1 home win over Blackburn Rovers, in a 2-2 draw at Wimbledon, a 1-1 home draw with Nottingham Forest and a 3-3 draw at Southampton.

However, after just one appearance during the 1999-00 season – a 0-4 home loss to Aston Villa – and a single appearance during the 2000-01 campaign – a 0-1 home defeat to Arsenal – Marlon returned to his first club, Sheffield Wednesday, in a loan spell in January 2001. He made his Owls debut in a 0-2 reverse at Blackburn Rovers and went on to make a further three appearances before returning to the Riverside Stadium.

Unable to dislodge Mark Schwarzer in the ‘Boro goal, and following the arrival of Mark Crossley, Marlon was pushed down to third-choice goalkeeper and, after appearing in a 0-2 loss at Liverpool, he returned to the club where he had made a name for himself – Burnley – in a loan spell in February 2002. Making his ‘second’ Clarets debut in a 0-2 home loss to West Bromwich Albion, Marlon went on to make a total of 13 League appearances in Division One before once more returning to Teeside.

However, it wasn’t to be his last spell at Turf Moor. Middlesborough released him and he joined Third Division York City on a short-term deal in August 2002 to help the club out during a goalkeeping crisis. He appeared in 6 League matches but he was soon, though, back with The Clarets, for the third time in his career, when he joined Stan Ternent’s side on a permanent basis in early September 2002 and spent over a year with the club, making 34 League appearances (42 appearances in all competitions).

He then left the club once more during the summer of 2003 and he signed for First Division Bradford City, once again on a short-term deal, in mid-September 2003. He made 5 appearances for The Bantams before making the move to Kenilworth Road.

On signing for the Hatters, Marlon said, "I had done a month with Bradford City and got a whisper that Luton were interested so I followed it up.

"I've heard some good things about Robert Beckwith and Dean Brill. They are two young, lively goalkeepers who will keep me on my toes."

Marlon made his Luton Town debut in a 1-1 home draw with Peterborough United on October 25th 2003 and he played in every single match thereafter over a three-month period, as his one-month deal was extended on two occasions. He played a total of 17 matches for the Hatters (11 in the League) and kept four clean sheets as he helped the club to the fringes of the play-off places and to the Fourth Round of the FA Cup.

The experienced shot-stopper had been in superb form for the club and earned the Umbro Isotonic Second Division Player of the Month award for December after several commanding performances between the sticks.

He had been offered a deal until the end of the season at Kenilworth Road as the Football League finally allowed the club to offer him an extended deal with the club on the verge of ending their spell in administrative receivership. However, Barnsley offered Marlon a longer contract, and with Hatters boss Mike Newell’s hands tied, the popular goalkeeper departed for Oakwell with the best wishes of the Luton Town staff and supporters – all of whom were desperately disappointed to see him leave.

He made his debut for the Tykes just a few days after leaving Kenilworth Road as he helped his new club earn a point in a 1-1 draw at eventually-relegated Notts County.

He remained as the number one goalkeeper at Oakwell for the remainder of the season as Barnsley's play-off bid faded away, Marlon making a total of 14 League appearances, including making a superb save to deny Steve Howard a goal in a 0-0 draw between Barnsley and the Hatters in March 2004.

However, the man that had taken Marlon to Barnsley – Icelander Gudjon Thordason – was sacked and replaced by former Nottingham Forest boss Paul Hart and Marlon wasn't as happy as he had been at Oakwell.

However, at the end of the 2003-04 season, Luton Town finally got new owners and came out of administrative receivership and the unhappy Marlon was offered a two-year by Hatters manager Mike Newell, who had only previously been able to offer the popular goalkeeper a month-to-month contract, while Barnsley had offered a much better deal.

Much happier during his time at Kenilworth Road, Marlon decided to return to Bedfordshire and signed the two-year with Luton Town, becoming Newell's first signing of the 2004-05 pre-season.

On re-signing Marlon, Newell said, "It's a similar type of thing to what we were trying to offer him last season.

"Unfortunately we were not able to do anything then and he went off to Barnsley, but I think he's realised how much he enjoyed it here.

"We're really pleased he's decided to come back and the important thing on the coaching side is he knows our two young lads (Robert Beckwith and Dean Brill) and they work well with him.

"We want them to be comfortable and Marlon was popular here and we did well when he was in the side."

Marlon had another excellent season during the 2004-05 campaign and he was once again Luton Town’s number 1 goalkeeper, despite strong competition from Dino Seremet, Dean Brill and Robert Beckwith.

Combining his playing duties with helping to coach the goalkeepers with former Chelsea and Celtic shot stopper and Russian international Dimitri Kharine, Marlon played in 38 of Luton Town’s 46 League matches during the 2004-05 season as the Hatters romped to the League One Championship. He also made a further three appearances in the Cup competitions.

Showing steady hands as always, great shot stopping and a general calmness that gives the defence in front of him great confidence, Marlon is arguably the best goalkeeper Luton Town have had in a number of years. He was also rewarded for his outstanding season by being one of six Luton Town players named in the PFA League One Team of the Season, as voted for by his fellow professionals

Once again a Championship player for the forthcoming 2005-06 season, Marlon gave the Hatters another boost when signing a new two-year extension to his current contract.

Marlon had another good season with Luton Town during the 2005-06 season as he again established himself as the Hatters number one goalkeeper.

The veteran shot-stopper fought off stern competition from youngster Dean Brill to continue between the sticks and help the club to a 10th placed finish in the Championship.

Missing the beginning of the season through injury, Marlon made his first appearance of the season in a 1-2 loss at Stoke City in mid-August 2005 and he went on to make 41 League appearances (43 in all competitions) during the course of the campaign.

Marlon had a rather disappointing 2006-07 season by his own standards and his loss of form arguably contributed to Luton’s woeful season that eventually saw them relegated from the Championship.

The veteran goalkeeper began the season between the sticks and helped the Hatters make a solid start to the campaign, but after a 5-1 win over Leeds United at the end of October, things started to go from bad to worse. The downward spiral for the team began with a 0-4 drubbing at Goodison Park against Premiership side Everton in a Carling Cup Third Round clash – a match that Marlon actually played superbly in and kept the score down with some tremendous saves, including a penalty stop from Mikel Arteta.

However, after looking back to his very best at Everton, Marlon’s form dipped – particularly in the following match, a televised 0-5 drubbing at Ipswich Town – his reactions seemed slower, his commandment of the box seemed to be waning and sections of the Hatters faithful began to question whether at 36-years-old, Marlon was ‘Past it’.

It set about a run of seven consecutive matches without a win in all competitions and Marlon – like the rest of the Hatters squad – took his fair share of criticism from Luton Town supporters.

With Luton plummeting down the Championship table faster than Linford Christie on a 100metre track, Marlon made an awful howler as he allowed a long-range shot to trickle helplessly under his body and into the net as Wolves won 2-3 at Kenilworth Road in early March 2007.

However, this didn’t deter manager Mike Newell from handing Marlon a new two-year contract – which he duly signed – that would keep him at Kenilworth Road until the summer of 2009 – at which time Marlon would be coming up to the age of 40.

Newell was, however, quickly sacked from his position as Luton Town manager and the Hatters replaced him with Luton-born Kevin Blackwell – a former professional goalkeeper himself – and he immediately dropped Marlon and replaced him with the younger Dean Brill for the remainder of the season as Luton dropped down to League One with a whimper. It therefore raised a question mark over whether Marlon would in fact still be a Luton Town player in the near future and if he fitted into Blackwell’s plans.

After a total of 26 League appearances during the season, Marlon was looking to re-establish himself as Luton Town’s number one goalkeeper for the forthcoming 2007-08 season as the Hatters looked to bounce back to the Championship at the first attempt. However, having been placed on the transfer-list by manager Kevin Blackwell, Marlon had it all to do.

Seemingly out-of-favour at Kenilworth Road under new Hatters manager and former goalkeeper Kevin Blackwell, Marlon hadn’t made a single first-team appearance in the first two months of the 2007-08 season and he was subsequently sent out on loan to League One rivals Oldham Athletic.

The veteran goalkeeper had seen Cardiff City’s David Forde and Tottenham Hotspur’s Ben Alnwick arrive at Luton on loan during the first two months of the campaign and it clearly showed that Marlon was not in Blackwell’s future plans.

He made his debut for Oldham in late October 2007 in a 1-1 draw at Huddersfield Town and he went on to make a total of 5 League appearances during his month’s stay at Boundary Park, plus a further outing in the Johnstone’s Paint Trophy.

However, he injured his hamstring during the warm-up before Oldham’s FA Cup First Round match with Doncaster Rovers and he subsequently returned to Bedfordshire to become the back-up once again to Dean Brill. Still on the transfer-list at Kenilworth Road and available for transfer (with a fee not likely to be sought), Marlon’s days with Luton Town under Kevin Blackwell certainly looked to be numbered.

With Brill continuing to perform well between the sticks, the arrival of Mick Harford as manager in January 2008 made little impact to Marlon and he was one of six players made available on a free transfer by Harford during the summer of 2008, with the club desperate to reduce the wage bill and rebuild the squad after relegation to League Two.

In August 2008, Marlon, like fellow goalkeeper Zac Barrett, and midfielders Steve Robinson and Darren Currie, and defender Alan Goodall, signed a deal that saw his contracted terminated and he departed Kenilworth Road with the best wishes of everyone at Luton Town after 116 League appearances for the Hatters.

Out of football for five months, Marlon returned to the game as he was appointed to the coaching staff at St Neots Town, managed by former Luton Town defender Marvin Johnson. He was joined on the coaching staff by his former Hatters team mate Paul Underwood. However, his stay was brief as Johnson was sacked soon after Marlon's arrival.

In 2009, Marlon was co-commentating on Burnley matches for 2BR Radio, whilst also a director of the Richard Clarke Academy, which he co-founded in January 2008. This is a training academy for students and professionals wishing to sit their Association of Certified & Chartered Accountants examinations. Their first Academy is located in Malta and has already taken over 70% of the Maltese market, which for a small Island, is large due to the country being a 'tax efficient' state and subsequently a large population of accountants.

In August 2009, they launched their Belfast site.