London Scottish Director of Rugby Mike Friday is set to leave the Club at the end of May.
Friday, who joined Scottish 19 months ago, moves on after helping steer the Club to their best league finishing in more than 16 years.
He initially joined as backs coach in September 2013, playing a key part in Scottish's progression during the 2013/14 season when they finished fifth in the Greene King IPA Championship.
Last summer he took on a new role as Director of Rugby heading up the High Performance Department for the 2014/15 season which concluded with London Scottish finishing third in the Championship, ensuring the Club's place in the end of season play-offs for the first time.
Friday said: “I have had a fantastic time being part of the Incredible Journey.
“With my other rugby and business interests, however, it’s not going to be sustainable for me to continue in the role and do the Club justice, so I have had to make the difficult decision to step down.
“I want to thank the players first and foremost for their commitment and resolve throughout this past season which has enabled them to achieve what they have.
“I am sure they can kick-on further next season, working with such a hard-working and talented coaching and High Performance team.”
He continued: “It has been enjoyable working with what is a passionate and experienced Board of Directors who have shown great trust in me over the last 19 months.
“I know they will ensure the Club continues to grow and move forward – assisted by the fantastic sponsors and fuelled by our loyal supporters.
“I will look on with interest to see how the settled squad goes next season.
“I’m confident they will be contenders for a top four finish once again.
“They are a talented, tight-knit group and the new arrivals will only complement this squad.”
London Scottish Chairman, Sir David Reid, said: “On behalf of the Club, I would like to thank Mike for his invaluable contribution over the last 19 months.
“The Club has made great strides forward during his time at London Scottish and we wish him all the very best in his future business and rugby pursuits.”