Update about.md

Author: mary-python

_pages/about.md

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-As of January 2025, I am currently in the interim period between the submission of my PhD thesis and the viva voce examination.
+As of February 2025, I have defended my PhD thesis and am on track to receive my doctorate in July 2025.
 
 I am now working as a Data Scientist in the [Infectious Diseases Data Observatory (IDDO)](https://www.iddo.org/), based at the Centre for Tropical Medicine and Global Health in Oxford.
 
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 News
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+* February 2025: Defended PhD thesis titled "Differentially Private Methods for Releasing Aggregated Multi-Dimensional Messages".
 * January 2025: Started postdoctoral role as Data Scientist at [IDDO, Oxford](https://www.iddo.org/).
 * November 2024: Submitted PhD thesis titled "Differentially Private Methods for Releasing Aggregated Multi-Dimensional Messages".
 * March 2023: Won Best Presentation Award at the [Warwick Postgraduate Colloquium in Computer Science](https://warwick.ac.uk/fac/sci/dcs/research/wpccs/wpccs23/), "Theory and Foundations" track, WPCCS'23.