Mark Kirkup

CEO & Signature Consultant

Mark Kirkup is the founder and CEO of ACGcert®, bringing over 25 years of experience in the autograph and memorabilia industry. Having spent decades working with collectors, dealers and private signing events across the entertainment and sports sectors, Mark has developed a deep understanding of autograph authentication and the evolving challenges within the collectibles market. Through ACGcert, Mark's vision is to provide collectors with a modern authentication service built on transparency, technology and integrity. His leadership focuses on combining traditional signature expertise with innovative tools such as exact-item image records and QR-linked authentication, helping to raise the standard of autograph verification for collectors worldwide.

Andrew Hemington

Sports Signature Consultant

Andrew Hemington brings more than 25 years of experience in the sports autograph world, having built a deep knowledge of signature characteristics across multiple sporting disciplines. Throughout decades of collecting, studying and handling signed memorabilia, Andrew has developed a trained eye for identifying authentic sports signatures and recognising the subtle variations that can occur throughout an athlete’s career. As ACGcert’s Sports Signature Consultant, Andrew provides specialist insight across a wide range of sporting autographs, helping ensure items are assessed with both technical knowledge and real-world collector understanding. His long-standing involvement in the memorabilia community allows him to support ACGcert’s authentication process with valuable historical context and expertise.

Luke Harrison

Modern Entertainment Signature Consultant

Luke Harrison is a specialist in modern film and television autographs, with more than 25 years of experience collecting and studying entertainment signatures. His long-standing involvement in the autograph community has given him extensive exposure to actors, signing environments and signature evolution within the modern entertainment industry. At ACGcert, Luke provides expert consultation on contemporary film and TV autographs, helping the team identify authentic signatures and recognise common patterns seen in genuine signing situations. His knowledge of modern entertainment personalities and autograph habits adds an important layer of specialist insight to the authentication process.

Beau Sparrow

Modern Music Signature Consultant

Beau Sparrow specialises in modern music autographs, with particular expertise in UK and American rock bands. As a long-time collector and enthusiast, Beau has developed an in-depth understanding of how musicians sign across different eras, tours and promotional events. Known within the collector community for his knowledge of Oasis and related Britpop artists, Beau brings valuable insight into the signatures of some of the most sought-after names in modern music memorabilia. His role at ACGcert helps ensure music autographs are reviewed with the specialist attention and genre knowledge they require.

Jean Michel Hall

James Bond Cast Signature Consultant

Jean Michel Hall is the founder of The Bond Archives and a recognised specialist in autographs from the James Bond film franchise. Through years of dedicated research and collecting, he has built an extensive knowledge base covering the signatures of Bond actors and cast members spanning the entire history of the iconic series. As ACGcert's James Bond Cast Signature Consultant, Jean Michel provides expert guidance on one of the most collected areas of film memorabilia. His expertise helps ensure that signatures connected to the Bond franchise are assessed with the historical accuracy and specialist knowledge they deserve.

Chris Stowe

Floyd Mayweather Jr. & Boxing Signature Consultant

Chris Stowe brings over 25 years of experience working within the sports memorabilia industry, with a strong focus on boxing and private signing events. Having worked closely with athletes and event organisers over many years, Chris has gained unique insight into how genuine signatures are produced in controlled signing environments. As ACGcert's Boxing Signature Consultant, Chris provides specialist expertise on boxing autographs, with particular knowledge of Floyd Mayweather Jr.’s signature. His direct involvement in private signing events allows him to offer valuable perspective on signature authenticity, signing conditions and autograph variations.

Nathaniel Lane

European Football Signature Consultant

Nathaniel Lane is a long-time football autograph collector with more than 25 years of experience gathering in-person signatures across the UK and Europe. His extensive travel and first-hand exposure to football signings have given him a strong understanding of how players sign in real-world environments. As ACGcert's European Football Signature Consultant, Nathaniel supports the authentication process by providing insight into player signatures from leagues across Europe. His knowledge of modern and historic football autographs helps ensure items are evaluated with both collector awareness and practical experience.

Jamie Crowley

Football Shirt Consultant

Jamie Crowley is the owner of Iconic Football Shirts and a recognised specialist in match-worn and match-issued football shirts. Through years of experience handling professional football memorabilia, Jamie has developed a detailed understanding of shirt manufacturing details, club issue variations and provenance indicators. As ACGcert's Football Shirt Consultant, Jamie provides expert guidance on the identification and authentication of match-worn and player-issued shirts. His knowledge helps ensure that shirts submitted for review are examined with the same level of scrutiny and expertise as signed memorabilia.

Kelly Emery

Memorabilia Auction & Fundraising Liaison Officer

Kelly Emery works closely with charities, auction organisers and fundraising initiatives within the memorabilia sector. Her role focuses on helping ensure that signed items used in fundraising auctions are presented with credibility and supported by reliable authentication. At ACGcert, Kelly acts as the key liaison between the company and charitable organisations, helping facilitate authentication support for fundraising events. Her work supports ACGcert’s commitment to protecting charities from unauthenticated memorabilia while helping maximise trust and confidence for donors and bidders.

Stuart Maximus Livermore

ACGcert Brand Icon

Stuart Maximus Livermore is honoured by ACGcert as a lasting symbol of the company's values and guiding principles. Stuart devoted his life to helping others from all backgrounds, inspiring those around him through kindness, generosity and a strong belief in doing the right thing. The ethos behind ACGcert is rooted in these same ideals — integrity, honesty and respect for the community we serve. In recognising Stuart as the brand's icon, ACGcert pays tribute to a life dedicated to helping people and aims to reflect those principles in everything the company stands for.