Born in Dublin, photographer and film-maker Tommy Weir has had a career spanning the arts. After graduation from Trinity College, he curated in the Douglas Hyde Gallery and went on to establish a gallery space at the City Arts Centre in Dublin. He was responsible for the early exhibitions of many leading Irish contemporary artists. In New York, after curating an exhibition for NYU, he set up an internal design department for BAM, the Brooklyn Academy of Music. He was a project manager for Pentagram, working under Michael Bierut and Paula Scher, for their cultural clients.

Returning to Ireland, he moved into film, and set up Janey Pictures with writer/director Marian Quinn. Their feature 32A, won Best First Feature at the Galway Film Fleadh and the Tiernan McBride Screenwriting Award. Nominated for several IFTAs including Best Picture and won the IFTA for Cinematography. 32A had its international premiere at the Berlinale and went to over 100 festivals worldwide. Their current feature film, TWIG, was the Opening Night Gala at the Dublin International Film Festival 2024. He has produced several films for artists, notably Walker and Walker, including Nightfall representing Ireland at the Venice Biennale. He also produced several films, including Black Square, for his sister, Grace Weir, exhibited in IMMA. He was Associate Producer on the drama Mapmaker, by Johnny Gogan, for Arte.

Since his MFA in Photography at Ulster University, he has participated in group exhibitions in Ireland, the UK and China. He has focussed on publishing, partnering with writers and poets. His Cillín project, initiated during his MFA, resulted in a solo exhibition of his photography at the RHA Gallery in Dublin. This subsequently toured Ireland and produced a publication with poet and author Una Mannion. His subsequent book, Keshcorran, emerged from a collaboration with poet, Julianna Holland. His current project The Sea Crosses Here in the Winter, involves two poets and two writers.

He teaches film and photography in Atlantic Technological University. His work is in public and private collections in the US, Ireland and the UK, including Trinity College Dublin, The Arts Council of Ireland, Ulster University, the Eastman Museum, and the Museum of Fine Arts, Houston.