The Rajouri Garden seat fell vacant after sitting legislator Jarnail Singh resigned from the Delhi Assembly to contest the Punjab Assembly elections.
Harjeet Singh, who has a transport business, started his career as a corporate executive and worked in various industries for approximately 25 years.
Singh is a graduate from the Delhi University.
According to the AAP, Singh is a committed party leader and one of the pillars of the party in west Delhi. He held various positions including Observer of Rajouri Garden Vidhan Sabha seat.
The by-election will be held on April 9.
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