1946
Born in Plainfield, New Jersey to Frederick Theodore and Doris Marie Moore Delgyer.
1965
Studies with Marjorie Van Emburgh and Dudley V. duCret.
1983
Receives the Philip Isenberg Award from Pen + Brush.
1987
Becomes president of the Board of Trustees of the duCret School of Art in Plainfield, New Jersey.
1991
Receives the Margaret Sussman Award from Pen + Brush.
2004
Serves as president of The Society of Animal Artists.
2005
Participates in a group show exhibition at the Cleveland Museum of Natural History.
2007
Named “Best in Show” from the Pastel Society of New Jersey at the Second Annual Members Exhibition.
2008
Holds a one-woman show at Swain Galleries in Plainfield, New Jersey.
2010
Holds a one-woman show at Wings Gallery in Fanwood, New Jersey.
2012
Becomes an Emeritus Member of the Salmagundi Club.
2012
Participates in a group show exhibition at the duCret School of Art.
2014
Participates in a group show, Artists for Conservation Pilot at Nova Southeastern University in Fort Lauderdale, Florida.
2015
Becomes a lecturer for Barnes & Noble Booksellers in Bridgewater, New Jersey.
2016
Swain’s Gallery hosts Leslie’s 40th Anniversary Exhibition.
2017
Receives the Bott-Borghi-Bransom Legacy Awar from the Society of Animal Artists
2017
Displays a piece at the Nature in Art Museum in Glouchester, England.
2018
Included in a show in at Walcot Chapel Greenery in Bath, England.
2019
Included in a show at Hunterdon Art Museum in Clinton, New Jersey.