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Meet The Team

Over 50 Years of Excellence in Stained Glass Craft and Conservation




After a long career in the heritage sector, Sarah joined the Trust as its director in 2008, having served as a trustee for a number of years. She has researched and published widely on stained glass history and conservation. She is currently Chairman of the Corpus Vitrearum Medii Aevi for Great Britain, and General Secretary of the International Scientific Committee for the Conservation of Stained Glass. She is a liveryman of the Worshipful Company of Glaziers, and is one of its expert members, evaluating conservation grants for its charitable foundation, the Glaziers Trust. Sarah is also a member of Durham Cathedral's Fabric Advisory Committee, and a member of the Diocesan Advisory Committees for both Oxford and York, as well as a member of the Morris  committee for the Society of Antiquaries' William and Jane Morris Fund. She is a senior lecturer in History of Art at the University of York and course director of its MA in Stained Glass Conservation and Heritage Management. At the York Glaziers Trust, Sarah leads a multinational team of experts in the craft.

Sarah Brown

Senior Conservators


Dipl. Rest. MA ACR - Principal Conservator

Nancy trained as a stained glass conservator at the University of Erfurt, before embarking on an Erasmus travelling scholarship in 1999, where she visited numerous leading stained glass studios in Germany and the UK such as Cologne Cathedral, the Schnuetgen Museum, Canterbury Cathedral, and Barley Studio. She has also undertaken an internship in preventative museum conservation at the National Railway Museum. Nancy worked in private practice for a number of years at Riverside Studio in Hull from 2000-2008. She secured her MA in Stained Glass Conservation and Heritage Management at the University of York in 2010, joining the Trust directly after. In addition to her role at the Trust, since 2011, Nancy has taught technical stained glass modules to postgraduate students at the University of York. She is an associate member of the Corpus Vitrearum's technical and scientific committee, and is an ICON accredited conservator. She is an expert in specialist environmental monitoring of stained glass. 

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Rachel Thomas ACR

BA ACR - Team Leader/Conservator/Glazier

Rachel trained as an illustrator before working in glass, graduating with a BA in Art and Design from Brighton University in 1994. After achieving her postgraduate certificate in art and design, Rachel taught for a number of years in London before undertaking an intensive course in stained glass under Paul San Casciani FMGP. She joined the Trust in 2005 after seven years at Holy Well Glass in Wells, Somerset. In addition to her work as a conservator, Rachel is an acclaimed designer of new stained glass. She has previously won the prestigious and highly competitive Stevens Award commission for her design for Birmingham's Assay Office, and in 2006 designed the first of three new windows for New College, Oxford, for which she won the York Guild of Building's craftsmanship award. She was awarded her Chemistry for Conservators qualification in 2009, is an ICON accredited conservator, and has previously served for eight years on the ICON Accreditation Committee, vetting and examining applications from potential candidates.  

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Conservators & Glaziers

Tony Cattle

Master Glazier

Tony trained as a conservation glazier at Barley Studio near York, and was formerly workshop manager at Riverside Studio, Hull. He joined the York Glaziers Trust in 2010 and now has over a decade of experience working for the Trust in such a critical role. In 2011, Tony won the prestigious Master's Award at the York Guild of Building's annual craftsmanship Awards for Excellence for his work re-glazing panels from York Minster's Great East Window. With a background of over 25 years in the industry, Tony leads in all associated tasks relating to conservation glazing and site work, and has trained several of our apprentices in these areas to a high standard. He also oversees all of the glazing for new commissions and fabricates protective glazing, and engineers any associated metalworks. 

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Janet Parkin

BA MCSD - Graphics/Design/Conservation

Trained as a graphic designer, Janet graduated with a diploma from the Society of Industrial Artists and Designers (now the Chartered Society of Designers), before working for a number of years as a graphic designer representing major international brands. In 2002 she begun her studies in archaeology at the University of York, before joining the Trust in 2005. She is an expert conservation glass-painter and is also an award-winning artist, having received the prestigious York Guild of Building Award for excellence in the craft in 2017. In addition to her work in conservation, in 2016 she designed the monumental glass screens for Welcome to Yorkshire's silver medal-winning RHS Chelsea Flower Show garden, designed by Matthew Wilson; winner also of the BBC/RHS People’s Choice Award.

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Anna Milsom

BA Icon CTQ - Team Leader/Conservator

Anna is a graduate of Manchester Metropolitan University, completing her BA in fine arts, textiles, and embroidery in 2004. After completing various short courses in stained glass at Leeds, she begun her career at the York Glaziers Trust in 2008 as an HLF-funded trainee, working on the conservation of York Minster's Great East Window. Highly proficient in conservation glass-painting, Anna has also collaborated with contemporary artists, helping translate their designs into stained glass. Gaining her Chemistry for Conservators qualification in 2010, Anna is also trained in full-frame and medium-format photography. She is a qualified ICON Conservation Technician.

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Sophie Gwynn

BA MA - Team Leader/Conservator

Having graduated with a BA in History of Art, Sophie went on to study for an MA in Stained Glass Conservation and Heritage Management at the University of York. She completed her MA in 2013, and then spent two years as a trainee glazier in the stained glass studio at Lincoln Cathedral Works Department. Sophie has undertaken training opportunities in a wide range of stained glass studios both nationally and internationally, including Uppsala Cathedral in Sweden, MC Lead Glaziers in Norfolk, Chapel Studios in Kings Langley, and Glasmalerei Peters in Paderborn, Germany, and at the York Glaziers Trust. She joined the Trust full-time in 2016.

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Lydia Walter

BA - Conservator/Glazier

After undertaking a foundation degree in art at Bath City College, Lydia completed her BA studies in Drawing at Falmouth University. She is a highly proficient draughtsman, having undertaken specialised modules in technical and life drawing, as well as emotive and gestalt drawing. Her drawings have often sought to capture light, and it was this element of art and design that led her to stained glass. Lydia excelled on her placement with the Trust in Spring 2019, and has since been retained as a trainee conservator. Her traineeship has been generously funded in part by the York Minster Fund (YMF). 

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Matt Nickels

BA MA - Site Team Leader/Glazier

Matt graduated with a BA from the University of Manchester in 2006, and has since specialised in stained glass. He comes to the Trust with over a decade of experience working and running his family-owned glazing business. Matt has worked on major projects such as the glazing of the Houses of Parliament. He is a series regular on the BBC One craft and restoration programme, The Repair Shop, appearing regularly as their specialist stained glass craftsman. Matt joined the Trust in 2019 after having graduated with a distinction from the University of York's MA in Stained Glass Conservation. His traineeship has been kindly supported by the York Minster Fund (YMF).

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Veronica Smith

BA MA - Team Leader/Conservator

After studying for a BA in Fine Art and History at Aberystwyth University, Veronica went on to study for an MA in the History of Art at the University of Manchester, and then the MA in Stained Glass Conservation and Heritage Management at the University of York, which she completed in 2016. She has previously won the Worshipful Company of Glazier's Ashton Hill Award where she undertook further training in glass-painting and conservation at Canterbury Cathedral Studios. She joined the Trust in 2021, and leads one of our site-based teams. In addition to her work as a conservator, Veronica also designs and makes her own stained glass artwork, and is currently completing her PhD on nineteenth-century secular stained glass.


Kieran Muir

BA HNC - Trainee Conservator

Trainee conservator Kieran completed a BA in Fine Art (Painting and Print-Making) in 2018, at the Glasgow School of Art. He subsequently went on to do a HNC in Art Glass at the City of Glasgow College where he worked on a stained glass commission for the Glasgow Royal Infirmary. In 2020-21 Kieran was awarded an Ashton Hill award from the Worshipful Glaziers, where he undertook a combined placement at Barley Studio and the YGT. He was retained by the YGT as a YMF-funded trainee.    


Abbie Jones

BA MA - Trainee Conservator

Abbie joined the YGT in 2021 after having completed a BA in Fine Art and Art History, and an MA in Textiles in Practice at the Manchester School of Art. She went on to specialise in print, and graduated in 2019. Alongside her studies, Abbie volunteered at Manchester Town Hall where she worked cleaning and packing historic artefacts. She joins the team at YGT as a trainee conservator. 


Grace Hall

MA - Trainee Conservator

Susanna Wyse Jackson

Business Manager

Marie Groll


After gaining her PhD, Marie has worked in various capacities as a stained glass consultant. She has been involved with major academic editorial projects for the British Corpus Vitrearum/ British Academy, and has also worked as a technical and art historical project leader with the international arts consultancy Büro Rauch, led by acclaimed stained glass expert Dr Ivo Rauch. Marie serves as the administrator for The Foundation, the charitable branch of the Worshipful Company of Glaziers and Painters of Glass, where she has been made an Honorary Freeman for her services to the Company. In her roles there, she supports and assesses all incoming conservation grant applications and also assists emerging young practitioners, connecting them to work placements with leading studios throughout the world. She has also been elected as the vice chair of the Institute of Conservation's (ICON's) stained glass group. After working since early 2017 for the York Glaziers Trust in a freelance capacity, Marie has now joined the team on a permanent basis. 


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