Add info on AG chair and secretary

Author: eduardo-rodrigues

organization/advisory-group.md

@@ -40,3 +40,9 @@ A nominal meeting schedule consists of one AG meeting per year, arranged to prec
 ## Advisory Group Chair Election
 
 The Advisory Group chair is elected annually and serves for 2 years, serving a maximum of 2 terms. The Steering Group secretary serves as returning officer and is in charge of running the election. Candidates for the chair of the Advisory Group can be nominated and can self-nominate. The election will be held by confidential ballot. In the case of a tie, with more than two candidates, the top two candidates are retained and a second round is held. If there is still a tie after the second round, the AG chair is decided by lot.
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+## Present and Past AG Chairs
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+## Present and Past Secretaries / Returning Officers
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+* Paul Laycock (Einstein Telescope, University of Geneva), 01/2025 -