I am taking a YA Lit class and have a project coming up where I am researching cross over writers. I know a few- James Patterson, JK Rowling, and PC Cast. Can you help me with others? All genres are welcome and book titles would be a great help.

Gena Showalter has a few teen books out White Rabbit Chronicles and Everlife.

Rachel Vincent has Soul Screamers series.

Sherrilyn Kenyon has Chronicles of Nick series.

Those are the only ones I can think of right now.

Kelly Armstrong - YA : The Summoning, Adult : Bitten

Meg Cabot - YA : The Princess Diaries, Adult : Size 12 is Not Fat

Juliana Stone - YA : Boys Like You, Adult : The Summer He Came Home

Harlan Coben - YA : Shelter, Adult : Deal Breaker

Wendy Corsi Staub - YA : Awakening, Adult : The Good Sister

Sara Shepard - YA : Pretty Little Liars, Adult : Everything We Ever Wanted

Ellen Hopkins - YA : Crank , Adult : Triangles

Johnathan Maberry - YA : Rot & Ruin, Adult : Patient Zero

Rainbow Rowell - YA : Fangirl, Adult : Landline

Sophie Jordan - YA : Reign of Shadows, Adult : Wicked in Your Arms

Morgan Rhodes - YA : Falling Kingdoms, Adult : (writing as Michelle Rowen) Bitten & Smitten

John Grisham's Theodore Boone series I think there are 4 books in it.

Alice Hoffman. There are several. Just search PBS by genre Teen & Young Adult