Our philosophy

The current partners of Plumb Line are quite varied in their backgrounds, training and work-style. We believe in simplicity: doing the core things and doing them right. For us that implies making real effort with our relationships, not just clients, but in our personal lives’ too. We have not arrived yet, but we are getting better every day. We have fun – not like ha-ha-ha, more like “what we get to do and call work is great!” We are privileged guests in our clients’ businesses and we try to handle this privilege with care and humility.

We all have experiences and periods of being stuck, as individuals, in team and also in business development. As partners we search creatively for holistic solutions to the benefit of the individual employee, the efficiency of the team and the sustainability of the business.

The team


Wickus Guelpa

B.A. Industrial Psychology
Wickus has 14 years’ experience in organisational development and has been consulting to a variety of businesses over the past 10 years. His focus is on relationship development within the work context whilst ensuring the most efficient organisational design and structures. The challenge of getting people to collaborate is one he relishes. Using self-knowledge and excellent self-management skills as the basis for his work, he facilitates sustainable change in people and teams. Wickus is our role fit, culture fit, team fit guy and shares his expert knowledge of small and medium businesses with great enthusiasm with business owners and managers.

Wickus is an accredited user of the Myers-Briggs Personality Type Indicator and the Belbin team profile instrument.


André Kilian

MTH Care & Counseling (Cum Laude); BTH; BA Psychology; Accredited MBTI Consultant; Accredited with the ESCI emotional intelligence assessment – Hay group international; Spiritual Intelligence practitioner accreditation from “The Oxford academy of Total Intelligence”; Accredited as Organic Coach using Organic Scorecard
André Kilian believes in the personal possibilities of individuals and that each individual has the ability to grow through self-reflection and awareness. His mission in life is to help people to STOP regularly, reflecting on what is important and why. André journeys with individuals through coaching and therapy in various contexts and draw on the ideas of narrative therapy to do this. This uses the unique circumstances and story of the individual to find meaning and ways to grow. He also incorporates ideas around Emotional Intelligence and Spiritual Intelligence in his work with individuals and believes that people need safe personal spaces to become more self-aware, more emotionally aware and intelligent in order to take responsibility for their lives.

André is currently busy with a PhD study in the field of human development focusing on Spiritual Intelligence. André believes in work-life balance and places a huge emphasis in his own life on relationships normally involving good coffee. He loves to spend time with Ilana and his 4 children as well as enough social time with friends. He is a keen follower of English Football after working and living in England for 4 years and loves rugby & cricket. Self-care is very important to him; therefore he plays squash regularly and sees a mentor & coach for his own debriefing once every two weeks.

It gives him great energy to be a witness of the growth in others’ lives through personal awareness and reflection, discovering pro-active personal plans.

Mareé Loubser

Mareé has 13 years’ experience in administration, having worked for various companies and worked with a broad spectrum of people. Her strength lies in her great compassion towards people and the ability to communicate effectively.

Plumb Line Story

Amos 7:8 “And the Lord said to me: Amos, what do you see? And I said: A plumb line. Then the Lord said: See, I am setting a plumb line in the midst of my people”.

The birth of Plumb line Business Intelligence was initially an individual journey of grace and acknowledgement of personal brokenness. This personal experience led to our believe that we are raised up by God to give direction and be plumb lines for others, being motivated to do what is right. Our purpose is to fulfill our potential as God intended, sharing our skills and talents with people in business. Why? Businesses, and specifically the people in it, are close to God’s heart, and there are clear instructions to be found in Scripture on how to achieve success in business. God has set a plumb line for us and we need to play our part in living our calling.