Ross Shewry-Maryan, who is on target to raise £2,000 for the NSPCC, said:
"This was my second London Marathon for the NSPCC and I was very proud to have beaten my time by almost 20 minutes this year.
"I love the buzz of a marathon; the adrenaline, the required mental toughness, grit and determination.
"I find myself needing to run as close as I can to supporters on the roadside. They really drive me on through the difficulties I face.
"I have a very busy life. As well as being a deputy head, I am also a father of four, a Chairman of Sussex Schools FA and a Director at Hastings United.
"To fit around my many obligations and responsibilities, training for the marathon took place during early mornings and late nights.
"I tried to vary my training to keep myself interested and ran through areas of natural beauty such as national parks or on Hastings seafront.
"The support I have received has been immense. I am delighted with the support which has come from so many people. I even had a child from my school donate £5 of their pocket money."
Asked why he was so keen to support the NSPCC, Ross said:
"The NSPCC is a charity that is close to my heart. I am a deputy head teacher in one of the most deprived areas of the country.
"Since my return to work from lockdown, I have seen first-hand the additional difficulties that many children have faced during the pandemic both in person and online.
"This charity does such amazing work to prevent cruelty to children. Every childhood is worth fighting for. It is as simple as that.
"Please give your support to ensure that all children get the future they deserve."
Kate Hershkowitz, NSPCC Community Fundraising Manager for Sussex, added:
"Ross is an absolute hero for undergoing such a tremendous physical challenge and raising over £1,500 for the NSPCC.
"His support and the money he raised will go a long way to ensure our local services can continue to support more children and young people in Sussex.
"The NSPCC is reliant on public donations - 90% of our income is dependent on the generosity of the public.
"For example, just £4 could pay for one of our trained volunteer counsellors to answer a child's call for help to Childline.
"Meanwhile, £22 could pay for a helpline practitioner for one hour, providing vital help and support to adults concerned about a child's welfare. Every penny counts.
"Together, let us help Ross raise £2,000 if not more! With your help, we can combat child abuse and create a better and safer world for the next generation.
"No child should be left to cope alone. We can make all the difference by supporting Ross today."