Despite the importance of the teachers’ role, many countries are facing teacher shortages and the problem of recruiting the required number of qualified teachers to meet demand. To deal with this common and complex scenario, several school systems are looking at developing lateral entry programmes to access the teaching profession and obtain teaching qualifications, by attracting highquality graduates and/or professionals from subject areas affected by shortages. Those who seek an alternative career in teaching, potentially via fast-track programmes, are often so-called Second-Career Teachers (SCTs): non-teaching professionals joining the classrooms after spending time in different previous careers. This Volume presents the research performed within the SecWell Project - Second Career Teachers Well-being: toward non-traditional professional development strategies, proposed by the University of Florence, Birmingham, and Cologne to explore the phenomenon of Second Career Teachers in the partner countries.