[1][2] Holland left school aged 16, to work at the Hook Estate and Kennels for Greyhound Racing Association trainer Randy Singleton, who was based at White City.

In September 1992, based at the Avon Park Kennels on Ringwood Road, in St Ives, Dorset[3] he applied for and was granted a National Greyhound Racing Club licence and gained an attachment at Portsmouth Stadium where he met his wife Nicky.

[6] In 2002 Graham and Nicky made the decision to move to Golden, County Tipperary in Ireland, they set up the Riverside Kennel on a seven-acre plot.

The following decade would see the kennel become the most significant in Ireland and arguably the United Kingdom, in 2012 Knockglass Billy won the Laurels and the following year Cabra Buck reached the 2013 Irish Greyhound Derby final [8] It was during 2015 that Holland was propelled into the leading trainer in Ireland, he won the Easter Cup with Sidarian Blaze,[9] the Oaks with Ballydoyle Honey [10] and the Champion Stakes with Sidarian Vega.

Six flawless runs saw him become the shortest winner of a final in the event's history and brought Holland equal with McKenna and Lynch on four Irish Derby titles.