“Donal created four illustrations for CreativeBond's (creativebond.ie) My IOU to you gift voucher. He delivered the illustrations on time for a good price and I was delighted with them. I'd be very happy to recommend Donal to anyone.” — Lindsay Bond O'Neill - Director, Creative Bond - Greeting Cards.

“Donal Casey’s political cartoons are unique, insightful and humorous “ — Jarlath Duffy, chairman – Athlone Literary Festival

“Donal’s creativity, sharp sense of satire and technical skill have made the job of including this type of content much simpler than we had hoped. His contribution to the development of our magazine Work & Life has been very significant and it is a relationship we hope to continue.” — Niall Shanahan, Communications officer – Impact trade union.

“There is no doubt either that young readers will be charmed by the full-colour illustrations by Donal Casey; they are excellent.” — Pól Ó Muirí - Irish Times: writing about the Irish-language children’s book Dhá Chluas Capaill ag Labhraí Loingseach

"There is a warmth to Donal’s work that is engaging - a vivacity and divilish optimism that is refreshing in an age of snide cynicism." — Manchán Magan, Author and television presenter