Jo­han­nes is an in­ter­na­tio­nal­ly re­co­gnis­ed le­gal ex­pert in ma­ri­ne ca­su­al­ties and da­ma­ge claims in the field of re­ne­wa­ble en­er­gy. He has ex­ten­si­ve ex­pe­ri­ence of ship col­li­si­ons, car­go ac­ci­dents, fire on board, ship­ping ac­ci­dents and sal­va­ge, bo­th at sea and in in­land wa­ter­ways, and when off­shore fa­ci­li­ties are af­fec­ted. His par­ti­cu­lar ex­per­ti­se lies in ca­ses in­vol­ving com­plex tech­ni­cal or nau­ti­cal is­su­es.  Jo­han­nes fre­quent­ly ad­vi­ses cli­ents in­vol­ved in ma­jor ship­buil­ding and char­te­ring pro­jects, in com­plex mul­ti-ju­ris­dic­tio­n­al da­ma­ge claims, and acts for cli­ents in li­ti­ga­ti­on be­fo­re the or­di­na­ry courts of law and ar­bi­tra­ti­on tri­bu­nals. Jo­han­nes acts for Ger­man and in­ter­na­tio­nal ship­ping com­pa­nies, their P&I clubs and other insu­rers, pro­ject de­ve­lo­pers, ma­jor in­dus­tri­al com­pa­nies and ship­y­ards.

Jo­han­nes is lis­ted in Who’s Who Le­gal 2018 as an espe­cial­ly re­com­men­ded la­wy­er, “a gre­at la­wy­er”, and as “a re­al ex­pert” on ship­ping law. In the JUVE Hand­book of Com­mer­cial Law Firms 2017/2018, Jo­han­nes is men­tio­ned as being “fre­quent­ly re­com­men­ded” in ma­ri­ti­me mat­ters. In the Le­gal 500, 2015, he is men­tio­ned as an “emi­nent ex­pert on in­land wa­ter­ways ship­ping law” and in the JUVE Hand­book 2014/2015 he is re­com­men­ded with a client’s ac­co­la­de “al­ways sa­tis­fied”. Cor­po­ra­te In­ter­na­tio­nal gran­ted Jo­han­nes the award “Ma­ri­ne Ca­su­al­ties La­wy­er of the Ye­ar in Ger­ma­ny 2019” .

In his free time Jo­han­nes de­vo­tes hims­elf avid­ly to sai­ling with his fa­mi­ly and to his clas­sic 1938-built mo­tor boat “MA­RIA av RA­NÖHAMN”.