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We asked GSA to run a research campaign into a specialist and quite technical market, with a fairly hard-to-reach audience, so it was never going to be a quick win. What stood out was the tenacity of the team — Monica kept us updated so we always knew where things stood, and Temara kept working the outreach rather than settling for the easy answers.

The outcome was a genuinely valuable set of data, along with several real opportunities we’re now following up. The reporting was clear, and they were happy to cut the findings a different way or set up follow-up conversations where we wanted to dig deeper.

A pleasure to work with, and I’d happily recommend them.

Coryton

As a sales leader, I have worked with many trainers over the years, and what sets Jonathan apart is his thoroughness in getting to know our specific business before setting out the training programme.

Jonathan invested significant time learning our market, sales motion, customer conversations, and objectives before designing a tailored programme for our Inside Sales team. Rather than delivering generic telesales training, he built a curriculum aligned to the realities of our business and the challenges our team faces every day. A genuine commitment to understanding our organisation was demonstrated to ensure that the training was relevant, practical, and immediately applicable.

His approach combined engaging classroom sessions with detailed one-to-one call coaching. The call reviews were particularly impactful, focusing not just on what our team was saying, but how they were saying it. He helped improve consistency across the team, strengthen rapport-building skills, sharpen discovery conversations, improve handoffs, establish clear next steps, and create more natural customer interactions that avoided sounding scripted.

Jonathan also introduced practical frameworks for handling gatekeepers, improving call structure, and increasing the effectiveness of outbound prospecting activities. Most importantly, he reinforced the discipline and consistency required to build a scalable inside sales organisation.

His coaching style is engaging, insightful, and highly practical. Team members received actionable feedback they could immediately apply, resulting in greater confidence, improved call quality, and a more professional and effective outbound sales approach.

I would strongly recommend Jonathan and the team at GSA to any revenue leader looking to improve the performance of their SDR, BDR, Inside Sales organisation (or, frankly, any team dealing with customers). Their ability to combine sales methodology, coaching, and real-world application delivers measurable value for both individuals and the business.  A personal thanks for a thoroughly engaging and enjoyable programme!

Electro Rent Europe
We used GSA for an event we had in London. They handled lead generation and telemarketing for the event. They were very thorough and touched base with us every step of the way to make sure the campaign was successful. They are professional and prompt and kept us up to date with the campaign and the milestones as we progressed closer to the event. I highly recommend if you need a telemarketing & B2B lead generation services you should reach out to GSA and talk to Jonathan and Monica
Boost Media International
I compared with 6 telemarketing training courses and decided on using GSA. I am really happy with the training structure, contents and the trainer – Jonathan Silverman. My team truly enjoyed the training and has already started to apply a few techniques while making prospecting phone calls. I would highly recommend Jonathan and his training course. The unique part of his course is that it is not a standard telemarketing course where you have the similar structure for every company. Jonathan spends his time listening to our needs to make sure the course is truly tailored to your company’s requirements. Thank you Jonathan.
Flexjet

I highly recommend the GSA team. The service they delivered was extremely responsive to all our requirements, and effective in getting Waisl in front of our senior decision-makers in hard-to-reach target airports.

For our European airport expansion, GSA executed a multi-channel exercise across phone, email, and LinkedIn, resulting in a robust database of core targets, within 21 key airports. The team successfully reached a significant number of Decision Making Contacts and delivered a professional, consistent approach that led to important discussions and engagement for our business development.

Their efforts led to concrete outcomes, securing high-level engagement at major hubs. GSA’s strategic and operational support was invaluable in helping WAISL navigate the complex, multi-front engagement required in the airport sector.

We would recommend them to any organisation with the objective to develop its B2B business.


Waisl
We engaged GSA to support our event delegate telemarketing campaign, and the results were excellent. Their team was professional, responsive and highly organised — they quickly understood our goals and delivered quality leads that helped boost delegate registration. Communication throughout the process was clear and efficient. We’re very pleased with the service and would happily work with them again.
The Surgery Show

We have been working with the GSA team since 2020 and the collaboration has been excellent in every aspect so far. Jonathan and his team are highly professional, responsive, adaptable and always available. They consistently demonstrate a strong understanding of our challenges and are able to adjust quickly and pragmatically.

GSA stands out for its solution-oriented mindset and true business partner approach. They are proactive reliable and continuously bring valuable ideas to the table.

A trusted and high-quality partnership that I highly recommend !

EDHEC Business School

We partnered with this agency and the experience was excellent. The team was highly professional, proactive, and attentive to our needs. They managed telemarketing effectively, ensuring clear communication and tangible results. A special mention goes to their Italian telemarketer, whose exceptional communication skills and ability to engage with our audience made a real difference. Highly recommended for anyone looking for a reliable, performance-driven partner.

Ansell
Having collaborated with Jonathan and his superb team for the last 13 years, I can easily say that they are consummate professionals and we look forward to working with them for many more years.
Peter Radcliffe, Founder
Exceptional service and can’t rate them high enough. Reporting is also exceptional!
Orthene

We partnered with GSA to support our sales efforts, and they exceeded our expectations. Kevin and the rest of the team were incredibly reliable and provided tremendous support throughout the campaign. They generated a significant number of highly qualified leads, which not only boosted our sales but also helped propel our business forward. Their reporting was impeccable, and we found their analytics incredibly useful in understanding campaign performance and refining our strategies. The campaign was a huge success, and we were thoroughly impressed with their professionalism and dedication. We would not hesitate to work with GSA again in the future

Halo
GSA’s telemarketing campaign carried out on our behalf produced a wealth of helpful information. Jonathan and Kevin provide a professional and friendly service, and their team of telemarketers must be among the best in class.
Motor Fuel Group

GSA demonstrated exceptional responsiveness to our evolving project demands and organisational needs. Julia adeptly understood our ideas and concepts and effectively captivated prospective leads with her exceptional telephone etiquette and strong communication skills.

The feedback and reporting provided by Kevin and Julia were incredibly insightful, enabling us to explore alternative avenues and make informed strategic choices.

I cannot speak highly enough of GSA for their blend of professionalism and personal touch in their engagement with our company. I wholeheartedly endorse their services.

Save Water Save Money
Loved the collaboration with GSA on a telemarketing project. they think along with you and very much flexible with their services.
Graco

GSA demonstrated exceptional responsiveness to our evolving project demands and organisational needs. Julia adeptly understood our ideas and concepts and effectively captivated prospective leads with her exceptional telephone etiquette and strong communication skills.

The feedback and reporting provided by Kevin and Julia were incredibly insightful, enabling us to explore alternative avenues and make informed strategic choices.

I cannot speak highly enough of GSA for their blend of professionalism and personal touch in their engagement with our company. I wholeheartedly endorse their services.

Save Water Save Money
A great positive approach to telemarketing, very open communication, and good results
Meon
Targeted approach and clear results. I cannot recommend the GSA team enough!
Miele Professional

We engaged GSA Marketing to do telemarketing/LinkedIn/Email campaigns for our company. We had a difficult and specific target audience, and GSA worked diligently over a few months to reach these people, and then deliver these campaigns efficiently and effectively. As a result of these campaigns we are now in communications with many of our most desired target leads, well down the long sales cycle that our business necessitates.

I would highly recommend GSA to everyone, I have really enjoyed working with Jonathan, Kevin and Alex. We will be carrying out more campaigns in the new year.

Enviro Waste Management

It was a joy working with the team from GSA. The ability to conduct weekly reviews directly with the telemarketers was very reassuring and allowed us to tweak our messages in a timely manner. We are very satisfied not only with the results, but the process and delivery as well.

ITMA Services
Jonathan and Kevin are incredibly knowledgable, patient and without doubt the experts in their field. They were fantastic at guiding myself and my colleague through a LinkedIn campaign and I was really pleased with the positive connections, conversations and brand awareness achieved.
The Film Farmers

We partnered with GSA so we could quickly, professionally, and effectively reach-out to our European customers. GSA enabled us to interact with our client base at a speed with which we would never have been able to replicate using just our in-house language team. We had regular, professional updates with the project team and had thorough and insightful quantitative data, as well as interesting qualitative feedback. It was an enjoyable and successful collaboration.

International Dance Supplies Ltd

We have worked with GSA for more than 10 years.  Throughout that time they have been simply outstanding.
From a campaign perspective, Kevin and Julia are quite the dream team – Julia’s ability to get to speak to the right individual and put across a compelling message is simply second to none & Kevin’s superb management of the campaign ensures you are fully updated at the click of a button.

Jonathan’s ability to transform our initial email/linked in wording into something that was both meaningful and concise ensured we had a superb hit rate.


We really can’t thank them enough and are already in discussions about our next campaign

Competent Adviser
Jonathan came to the Miele offices to train our Inside Sales Team. The sessions were well structured and gave the Team confidence and new skills to begin outbound dialling. Having Jonathan listen to calls and give feedback was great. Thank you GSA!
Miele
We have known Jonathan and his team at GSA for many years. Having used them on multiple B2B campaigns I can certainty recommend them to any company needing an effective telemarketing company that is focused on results. GSA’s telemarketers have vast experience and the effort they go to understand the product and service is brilliant and shows in the results. Keep up the great work!
Adkwik

GSA has supported my team over a number of years to deliver high quality leads to our sales teams. Their professional approach from the initial brief through to calling and reporting, fully integrates into our lead generation campaigns.

Veolia
We have used Jonathan several times and just finished another training session. The training is from someone who teaches from up-to-date experience. I fully recommend GSA.
Asquith

We worked with GSA on a B2B marketing campaign following sub-par results using in-house resources. We initially decided on a set number of hours but ended up doubling it after our conversion rate was increased by an amazing 108%. GSA ensured our campaign results were updated on a daily basis and their team followed up with us weekly to ensure the campaign was going as planned. We were impressed with the team’s professional, yet warm manner, making them an absolute pleasure to work with. We look forward to working with GSA in the future.

Nuclei Group 

The GSA team have been supporting some of our Marketing outreach efforts and we could not be more satisfied with the service. They are great at giving advice, professional in executing campaigns, and efficient in driving results. A real pleasure to work with them

 

Oxentia Ltd

The team at GSA were extremely helpful and professional, providing advice and thorough explanations on each part of the project we worked with them on. They took the time to meet with us face to face, to discuss the best way to approach the work, and were available to speak to whenever needed. Jonathan is a fountain of knowledge and went above and beyond to help us with any questions we had. It wasn’t the easiest project to work on but GSA helped every step of the way. Thank you!

U+I Global PLC

We were extremely pleased with the activity since we had a large unqualified database that meant our internal team were unable to identify and focus on the best targets for new business development. With the help of GSA, we were able to reach out to prime prospects much more quickly for higher value sales. We would recommend GSA for anyone that wants to generate targeted leads for their business.

FÖRST GmbH

Fully recommended Jonathan & Kevin and the rest of the GSA team and the service they offer. Very easy to work with and delivered real results for our business despite the campaign being seriously impacted by CV19!

HTS Spares

We used GSA for a series of training courses across our national and international teams. Jonathan was engaging, knowledgeable and provided refreshing insights into sales and marketing techniques. His dynamic approach motivated the teams to ask questions which he gladly answered! I would highly recommend Jonathan and his team to anyone looking to improve Business Development performance.

Tenmat

Right from the start GSA understood the needs of our cross-Europe tele-research campaign fully & were able to advise and adapt to our specific requirements. The daily reporting helped us understand, first-hand, how the campaign was progressing and help keep costs within the allocated budgets. They were very flexible in terms of the native speakers used as subsequent data was added to the project. I would highly recommend them and will certainly be using them for other projects”

OKI Europe Ltd

“IP Solutions uses outbound calling as one of its main routes to market. Our senior sales team are consultative by nature and have a wealth of experience. However, lead generation via the phone was a discipline where we felt some polishing of techniques would be useful. We therefore asked Jonathan to come in and run a session for our sales guys. Faced with this slightly unusual requirement, Jonathan tailored a course based on a pre-course day at our office listening to the team and understanding their needs. The resulting course was interactive, fast-paced and well executed. It was enjoyed by the whole team. They’ve subsequently been able to put into practice the techniques Jonathan provided that supplement their strengths in providing IP Solutions services to prospective clients. We’d recommend Jonathan to any company looking for a tailored course for their requirements.”

Chief Marketing Officer, IP Solutions

The Sales team at Ultrimax were impressed with the professional assistance of GSA Business Development, clear visual reporting on a daily basis ensured focused efforts on generating well profiled leads, which helped bolster our ongoing sales growth in 2019. I would recommend GSA Business Development to anyone looking for that extra support in lead generation

Ultrimax

GSA are a company with a difference, adding value above what is expected when it comes to telephone campaigns. To be specific about that, we got advice and data cleansing as extras. They are willing to link in with systems and have outstanding reporting. But more than all of that they are transparent so that you know exactly where you stand on a campaign. We would recommend them.

Plus Packaging

GSA allowed us to explore a new vertical and gave us valuable insight into this new market.

They delivered on the campaign goals and we were really impressed with the quality of the calls.

 

Wexer

GSA’s training and consultancy has uncovered potential that we were unable to see ourselves. The training itself was excellent and the days in the office before and after the training were exponentially beneficial.

Packaging Company
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