Appointed Election Commissioner by the President on 31 Aug 2017 (Ministry of Law & Justice announcement) and took over as CEC on 2 Dec 2018 on the retirement of O.P. Rawat, as the senior Election Commissioner. No selection committee existed then. Before the 2023 Act there was no statute on selection: the Union government, by convention, picked senior serving or retired Secretary-rank officers and the President appointed on its advice, with the senior-most EC normally elevated to CEC (as described by the Supreme Court in Anoop Baranwal, 2 Mar 2023).
source ↗Education: B.A. (Hons) and M.A. in English, Panjab University (Hoshiarpur) - per ECI profile
At a full meeting, CEC Arora and EC Sushil Chandra outvoted Lavasa: minutes of Commission meetings would include all members' views, but orders on code complaints would continue to reflect only the majority, and dissent would not be made public.
Reported via an ECI official's statement to Deccan Herald; no formal instruction document was located.