Knock Knock, founded in 2002 by former book editor Jen Bilik in Los Angeles, is a witty stationery and gift brand that combines clever humor, creative design, and practical function in products like notepads, journals, books, and affirmation cards. Since expanding into book publishing and acquiring brands like Emily McDowell Studio (now Em & Friends), Knock Knock continues to bring smart, irreverent stationery and gifts to a global audience.