G. Bruce Berriman


G. Bruce Berriman is the Chair of the IVOA Executive Committee from May 2021 to October 2022.




Astronomical Image Processing at Scale With Pegasus and Montage.
G. Bruce Berriman, Ewa Deelman, John Good

Image processing at scale is a powerful tool for creating new datasets and integrating them with existing data sets, and performing analysis and quality assurance investigations. Workflow managers offer advantages in this type of processing, which involve multiple data access and processing steps. Generally, they enable automation of the workflow by locating data and resources, recovery from failures, and monitoring of performance, We demonstrate in this focus demo the use of the Python API of the Pegasus Workflow Manager ( to manage processing of images to create mosaics with the Montage Image Mosaic engine ( Since 2001, Pegasus has been developed and maintained at ISI, USC. Montage was in fact one of the first applications used to design Pegasus and optimize its performance. Pegasus has since found application in many areas of science. LIGO exploited it in making discoveries of black holes ( . The Vera Rubin Observatory used it to compare the cost and performance of processing images on cloud platforms ( While these are examples of projects at large scale, investigations on local clusters of machines by small team can benefit from Pegasus as well. We describe how astronomers can use the Pegasus Python API to plan and execute workflows to create visualizations of the sky that comply with the Hierarchical Progressive Survey (HiPS) standards, on local and on cloud platforms.

Grand Ballroom
The International Virtual Observatory in 2021
G. Bruce Berriman

The International Virtual Observatory Alliance (IVOA) develops the technical standards needed for seamless discovery of and access to astronomy data worldwide, with the goal of realizing the Virtual Observatory (VO). Founded in 2002, the IVOA was an early advocate of what are now known as  Findable, Accessible, Interoperable and Reusable (FAIR) principles. There are 22 member organizations, and astronomical communities from other nations have shown interest in joining the IVOA. This paper describes the activities of the IVOA in 2021; summarizes the activities at the May and November 2021 virtual "interoperability meetings"; describes the impact of IVOA activities on the astronomy community; and discusses its prospects for 2022 and beyond.