Its active time as a professional player, he spent 1961 to 1962 with Borussia Mönchengladbach 1962-1964 at SC Viktoria Cologne and from 1964 to 1966 at Hertha BSC. He had his last and longest station from 1966 to 1971 at MSV Duisburg.
Subsequently, he was an assistant coach and took over on 22 October 1973 the Head Coach Post by Rudi Alberts, which he held until 1976, before he joined Bayer 04 Leverkusen in the 2nd Bundesliga.
Matchday fourth last season 1978/79 Bayer 04 Leverkusen lacked even a point to the rise in the Bundesliga. This should be gained in the home match against Bayer 05 Uerdingen. About 20 minutes before the end of the meeting it was 0:3 - yet his team achieved the ascension -locking 3:3. Kremer remained until 1981 in Leverkusen, Germany. In 1982 he had a short spell at TSV 1860 München, the same year he moved to Fortuna Dusseldorf.
1985 ended his time in Düsseldorf. He was coach of Eintracht Braunschweig, where he was made redundant again after less than a year. 1989 saw a return to his first coach station for MSV Duisburg. In 1992 he moved to Tennis Borussia Berlin. After seven defeats in a row he said in October 1993 asking for his leave of absence, which was granted. But since his successors were not successful as he was, he was, in 1994, committed - and released again after a unsatisfactory verlaufenen first round.
Since 1994 Kremer players observer is 04 Leverkusen Bayer.