Which professor is Oliy Spratling working with? Give the full name.
research assistant refers to the student who serves for research where the abbreviation is RA; full name refers to f_name and l_name;
SELECT T1.first_name, T1.last_name FROM prof AS T1 INNER JOIN RA AS T2 ON T1.prof_id = T2.prof_id INNER JOIN student AS T3 ON T2.student_id = T3.student_id WHERE T3.f_name = 'Oliy' AND T3.l_name = 'Spratling'