![The manager of the Spanish handball club FC Barcelona, Xavier O'Callaghan, Stock Photo, Picture And Rights Managed Image. Pic. PAH-57670516 | agefotostock The manager of the Spanish handball club FC Barcelona, Xavier O'Callaghan, Stock Photo, Picture And Rights Managed Image. Pic. PAH-57670516 | agefotostock](https://previews.agefotostock.com/previewimage/medibigoff/c47c5f8c109c65f75a5475157272eb6f/pah-57670516.jpg)
The manager of the Spanish handball club FC Barcelona, Xavier O'Callaghan, Stock Photo, Picture And Rights Managed Image. Pic. PAH-57670516 | agefotostock
![Australia's Webb and O'Callaghan row during the lightweight men's pairs semi-finals at the World Rowing Championships near Barcelona. Ben Webb (L) and Tim O'Callaghan of Australia row during the lightweight men's pairs Australia's Webb and O'Callaghan row during the lightweight men's pairs semi-finals at the World Rowing Championships near Barcelona. Ben Webb (L) and Tim O'Callaghan of Australia row during the lightweight men's pairs](https://c8.alamy.com/comp/2D3FAFE/australias-webb-and-ocallaghan-row-during-the-lightweight-mens-pairs-semi-finals-at-the-world-rowing-championships-near-barcelona-ben-webb-l-and-tim-ocallaghan-of-australia-row-during-the-lightweight-mens-pairs-semi-finals-at-the-world-rowing-championships-on-lake-banyoles-near-barcelona-july-30-2004-the-pair-qualified-for-final-a-the-world-rowing-championships-run-till-august-1-reuters-victor-fraile-2D3FAFE.jpg)
Australia's Webb and O'Callaghan row during the lightweight men's pairs semi-finals at the World Rowing Championships near Barcelona. Ben Webb (L) and Tim O'Callaghan of Australia row during the lightweight men's pairs
![La Dècada Coagular. Performance by Marc O'Callaghan | la Capella | Barcelona - Ajuntament de Barcelona La Dècada Coagular. Performance by Marc O'Callaghan | la Capella | Barcelona - Ajuntament de Barcelona](https://www.lacapella.barcelona/sites/default/files/styles/slider_project/public/2019-01/Disposicio%20Objectes_0.jpg?itok=tFlRNi68)
La Dècada Coagular. Performance by Marc O'Callaghan | la Capella | Barcelona - Ajuntament de Barcelona
![Juan O'CALLAGHAN | Professor (Full) | PhD | Universitat Politècnica de Catalunya, Barcelona | UPC | Department of Signal Theory and Communications (TSC) | Research profile Juan O'CALLAGHAN | Professor (Full) | PhD | Universitat Politècnica de Catalunya, Barcelona | UPC | Department of Signal Theory and Communications (TSC) | Research profile](https://i1.rgstatic.net/ii/profile.image/365525533249538-1464159486907_Q512/Juan-Ocallaghan.jpg)