Celebrity chef Matt Kemp's anger management issues cost him his first marriage and his business. One of his most shameful moments was broadcast on national television when he labelled his pregnant wife a 'c***'. During an episode of SBS's Heat in the Kitchen, Kemp was so enraged he unleashed an expletive-ridden tirade on his then-wife Lela Radojkovic, who was carrying their first child, while filming at Sydney's Restaurant Balzac in 2004. Scroll down for video . The extent of Matt Kemp's rage is seen during an episode of SBS's Heat in the Kitchen, which was broadcasted in 2004 . Kemp is pictured here with his fiancee, Christie Webber, who is marrying at the end of the year . The award-winning chef told Radojkovic: 'If you weren't my f***ing wife I would f***ing sack you - you c***.' Looking back, Kemp says he regrets treating his ex-wife that way. 'It really makes you feel proud of the human I was, not. You say things in the heat of the moment that you don't even think about until someone catches it on TV,' he told Daily Mail Australia. Kemp discusses his anger issues on Tuesday's episode of Insight on SBS. The chef is pictured here with three of his children. He said he missed out on a lot of their childhoods . Kemp (second from left) is pictured here with My Kitchen Rules judge Colin Fassnidge . The 44-year-old said he would work himself into a 'frenzy' because of his uncontrollable rage. 'I would be doing so many things that my head would explode - you can't clone yourself,' Kemp told Daily Mail Australia. 'I would get so angry and worked up that I couldn't speak.' It also isolated him from his kitchen staff who he said at the time he did not care about, but now he takes the time to praise them. One of his biggest regrets before he 'grew up' and became less 'hot headed' was not being there for the births of his children. 'Before I wouldn't take time off for work and if I did I would never stop thinking about it,' Kemp told Daily Mail Australia. Former NRL player Mark Geyer also had anger management issues and appears on Insight on Tuesday alongside Kemp . Geyer, who used to play for the Penrith Panthers, is pictured here with his wife, Meagan, who he describes as his rock . 'I didn't see my first two children get born. I didn't see my third child really get born. 'I've got four kids, I've got to be a dad, that sort of thing makes you grow up a bit. 'I want to be a dad. I want to spend time with them.' Kemp attributes getting older as a reason why he decided to change his attitude and behaviour about five years ago. The chef now works at Charing Cross Hotel in Waverley - in Sydney's east - and still raises his voice in the kitchen, but it does not escalate to 'uncontrollable rage'. After turning his life around, Kemp met his fiancee, Christie Webber, who he will marry at the end of the year. Another panellist on Tuesday's Insight is former NRL player Mark Geyer, 47, who got in trouble a number of times for violence after consuming alcohol. 'I got charged with assault when I was 22. I have a record for the rest of my life,' he told Daily Mail Australia. 'I didn't walk away. I never started the fight in the pubs and clubs, but I finished them. 'There was a ticking bomb inside of me.' The proud father-of-five said having children was the push he needed to turn his life around . The family man has urged people to 'walk away' from a fight and not engage in fights . The proud father-of-five credits his turnaround to his children, without any help from a counsellor. He said the anger he felt before was now being re-directed to get angry at things that could hurt his children. 'The whole reason I stopped being a mug and stopped my anger was because I had children,' Geyer told Daily Mail Australia. 'I suddenly had someone to worry about instead of myself.' Geyer, who works on-air for Sydney's Triple M, told Daily Mail Australia he was 'a volcano waiting to erupt' between the ages of 17 and 26. He said the two reasons why he acted so aggressively was because he was bigger than most people and he used his size to intimidate people. Kemp and Geyer will appear on Insight's Anger episode on SBS One on Tuesday from 8.30pm . The former Penrith player said his turning point happened when his wife, Meagan, was pregnant with their first child. He said she told him to clean his act up and become the man she had married. 'I saw the ultrasound of my first baby and it made sense,' Geyer said. 'I come from a great family there was no excuse... I was becoming the opposite of what my parents wanted me to be.' Geyer urged people who had similar issues that he did to watch Insight and start to change their lives. 'I try to tell my kids, walk away,' he said. 'If you see someone in dramas always try to help, but if they're looking for trouble it's a mug's game.' Insight's Anger episode airs on Tuesday from 8.30pm on SBS One.
Chef Matt Kemp and former footballer Mark Geyer have spoken out about their anger issues . Kemp said his 'uncontrollable rage' cost him his marriage and his business . Once, the celebrity chef called his ex-wife a 'c***' on national television . While Geyer said he would get into a lot of fights after drinking alcohol . The former NRL player said he turned it around after the birth of first child .