Lewis call Dickinson as existential type of pioneer.
Explanation:
Gwyneth Lewis called Emily Dickinson as an Existential Pioneer because Emily believed to make decision on her own and her poem also surrounds about taking own decisions without consulting anyone from outside world. She does not take opinions from people on Religion or Decision.
She had her own way of doing it and it shows why her poem was not famous and why she avoided being famous through her writings. She made sure her words are simple and reach a lot of people stated Lewis on Emily.