Jan is an elder of the church in Nové Mĕsto nad Metují and and teaches pedagogy (the methods and practices of teaching) at the university in Hradec Králové.
Jan was brought up in a Christian family in the Czech Republic. He was converted. He came to the UK in 1997 for the EMF School of Biblical Studies. Lucie was born to non-religious parents; her interest in the Gospel was aroused while she was still at school and was invited to a series of evangelistic meetings. She was converted some months later. The couple married in 1999 and have a son and daughter, Vojta and Barunka.
On his return from England, Jan resumed his university studies, qualifying as a school teacher. In 2001 Jan became pastor of a church in Nové Mĕsto nad Metují in the north-west of the country. With increasing numbers attending the services and church activities, friends and members of the church refurbished a dilapidated old building to use as their permanent meeting place. In September 2008 Jan also became a part-time lecturer at Hradec Králové University.
In 2011 the Hábls moved to Ústi nad Labem. Jan pastored a large church there and taught in the university.
In 2016 they returned to Nové Mĕsto nad Metují and Jan once again pastored the church (on a voluntary basis) and taught pedagogy at the university in Hradec Králové.
In 2018 the Nové Město congregation elected a full-time pastor (Jakub Škarvan). Jan is the chairman of the elders and preaches regularly both in his congregation and in churches around the country. Jan is often invited for semi-evangelistic or pre-evangelistic events by local churches or Christian schools and other institutions, he holds about 40 public lectures a year.