Known for being one of most prominent casting directors in Hollywood, Mary Hidalgo started her career as casting director on the small screen and got casting for television series like The Itsy Bitsy Spider (1994), The Adventures of Hyperman (1995-1996), The Oz Kids (1996) and Life with Louie (1995-1997).

A career spanning over three decades, she has worked with production houses like Disney, Universal and DreamWorks Animations. Some of her notable works are A Bug's Life (1998), Tarzan (1999), Toy Story 2 (1999), Monsters, Inc. (2001), Lilo & Stitch (2002), Finding Nemo (2003), and The Incredibles (2004). Her casting credits include Hotel Transylvania (2012) and its second installment, Hotel Transylvania 2 (2015), The Lego Movie and its second installment, The Lego Movie 2: The Second Part (2019).